AR-PD-176 PURCHASE DESCRIPTION FOR M320 GRENADIER SIGHTING SYSTEM (GSS).pdf

AR-PD-176

CAGE Code: 19200

12 October 2016

PURCHASE DESCRIPTION

FOR

M320 GRENADIER SIGHTING SYSTEM (GSS)

U.S. Army RDECOM-ARDEC

Picatinny, NJ 07806-5000

Prepared by:

RDECOM-ARDEC Quality Engineering & System Assurance Fire Control Q/R/S, RDAR-EIQ-WA

DISTRIBUTION STATEMENT A. Approved for public release, distribution is unlimited.

1 SCOPE

This specification prescribes the requirements and identifies the verification procedures for the M320 Grenadier Sighting System (GSS) designed for mounting to the M320/M320A1Grenade Launcher Module (GLM) in the M16A4 and M4A1 underbarrel configuration and in the M320 GLM standalone configuration.

2 APPLICABLE DOCUMENTS

2.1 General

The documents listed in this section are specified in sections 3 and 4 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3 and 4 of this specification, whether or not they are listed.

2.2 Government documents

2.2.1 Specifications, standards and handbooks

The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.

FEDERAL SPECIFICATIONS

FED-STD-595 C Colors Used in Government Procurement, 16JAN2008

DEFENSE FEDERAL ACQUISITION REGULATION SUPPLEMENT

DFARS 252.211-7003 Item Identification and Valuation

DEPARTMENT OF DEFENSE DIRECTIVE

DODD 4160.28-VOL 3 Defense Demilitarization: Procedural Guidance,

2011.06.07 DODD 5000.02 Operation of the Defense Acquisition System.

2013.11.26

DEPARTMENT OF DEFENSE SPECIFICATIONS

MIL-PRF-13830B Optical Components for Fire Control Instruments;

General Specification Governing the Manufacture, Assembly, and Inspection of

MIL-PRF-372 Cleaning Compound, Solvent (For Bore of Small Arms and Automatic Aircraft Weapons)

MIL-PRF-14107 Lubricating Oil, Weapons, Low Temperature MIL-F-13926B Fire Control Materiel, Manufacture and Inspection, Genral Specification For MIL-G-21164 Grease, Molybdenum Disulfide, For Low and High

Temperatures, NATO Code Number G-353 MIL-L-46000 Lubricant, Semi-Fluid (Automatic Weapons) MIL-PRF-63460 Lubricant, Cleaner, and Preservative for Weapons and Weapons Systems MIL-W-13855 Weapons: Small Arms and Aircraft Armament

Systems, General Specification for MIL-W-63150 Weapons and Support Material, Standard Quality

Assurance Provisions for.

Interface Control Document Weapon Mounted Ballistic Calculators and Micro

Displays Rev B

DEPARTMENT OF DEFENSE STANDARDS

MIL-STD-129 Marking for Shipment and Storage

MIL-STD-130 Identification Marking of U.S, Military Property MIL-STD-810 Department of Defense Test Method Standard for

Environmental Engineering Considerations and Laboratory Tests

MIL-STD-1913 Dimensioning of Accessory Mounting Rail for Small Arms Weapons MIL-STD-1916 DOD Preferred Methods for Acceptance of Product

MIL-STD-461 Electromagnetic Emission and Susceptibility Requirements for the Control of Electromagnetic

MIL-STD-464 Electromagnetic Environmental Effects Requirements for Systems MIL-STD-40051-2 DOD Standard Practice Technical Manuals

MIL-STD-1424 Laser Warning Labels MIL-STD-1472 Human Engineering Design Criteria for Military Components, Equipment and Facilities MIL-STD-1474 Noise Limits

ARMY FIELD MANUAL

FM 3-05.211 Special Forces Military Free-Fall Operations FM 3-21.220 Static Line Parachuting Techniques and Tactics

ARMY TEST OPERATIONS PROCEDURES

TOP 1-2-511 Electromagnetic Environmental Effects System

Testing TOP 3-2-030 Grenade Launchers

(Copies of these documents are available online at http://quicksearch.dla.mil/ or from the Standardization Documents Order Desk, 700 Robbins Avenue, Bldg. 4D, Philadelphia, PA 19111-5904)

2.2.2 Other Government documents, drawings and publications

The following other Government documents, drawings and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.

U.S. ARMY ARMAMENT RESEARCH, DEVELOPMENT AND ENGINEERING

CENTER (ARDEC) DRAWINGS

DWG 7680606 Tester, Abrasion Optical Coating

(Copies of these drawings may be requested online at pica.drawing.request@conus.army.mil or from US Army ARDEC, ATTN: RDAR-AIS-TD, Picatinny Arsenal, NJ 07806-5000.)

NATIONAL STOCK NUMBER

NSN: 6850-00-965-2332 Carbon Removing Compound NSN: 5180-00-357-7770 Tool Kit, Small Arms Repairman

U.S. ARMY DEVELOPMENTAL TEST COMMAND

ITOP 4-2-602 Rough Handling Tests TOP 3-2-045 Test Operations Procedures for Small Arms - Hand and Shoulder Weapons and Machineguns, dated 17 September 2007 TOP 3-2-609 Chemical Compatibility of Non-Metallic Materials used in Small Arms Systems

TOP 1-2-511 Electromagnetic Environmental Effects System

U.S. ARMY FIELD MANUALS

FM 3-22.9 Rifle Marksmanship M16-/M4-series Weapons

(Copies of these documents may be ordered from the US Army Developmental Test Command, ATTN: Publications, 314 Longs Corner Road, Aberdeen Proving Ground, MD 21005-5005, or online at http://www.dtc.army.mil/publications/topsindex.aspx.)

http://quicksearch.dla.mil/ file:///%5C%5Cpdn%5Cprojects%5CAEF%5CFsf-r%5CPROJECTS%5CM320_GSS%5CAppData%5CLocal%5CMicrosoft%5CWindows%5CTemporary%20Internet%20Files%5CContent.Outlook%5CAppData%5CLocal%5CMicrosoft%5CWindows%5CTemporary%20Internet%20Files%5CContent.Outlook%5CAppData%5CLocal%5CMicrosoft%5CWindows%5CTemporary%20Internet%20Files%5CContent.Outlook%5CAppData%5CLocal%5CMicrosoft%5CWindows%5CDocuments%20and%20Settings%5Cmarcos.vasquez%5CLocal%20Settings%5CTemporary%20Internet%20Files%5Cmarcos.vasquez%5CLocal%20Settings%5CTemporary%20Internet%20Files%5CContent.Outlook%5CLocal%20Settings%5CTemporary%20Internet%20Files%5CContent.Outlook%5CLocal%20Settings%5CTemporary%20Internet%20Files%5CAppData%5CLocal%5CMicrosoft%5CWindows%5CTemporary%20Internet%20Files%5CContent.Outlook%5CLocal%20Settings%5CTemporary%20Internet%20Files%5CContent.Outlook%5CLocal%20Settings%5CDesktop%5CM16%20DTL%5Cpica.drawing.request@conus.army.mil http://www.dtc.army.mil/publications/topsindex.aspx

2.3 Non-Government publications

The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.

AMERICAN SOCIETY FOR TESTING AND MATERIALS INTERNATIONAL

(ASTM International)

ASTM E1444 Standard Practice for Magnetic Particle

Examination ASTM D1141E1 Standard Specification for Substitute Ocean Water

(Copies of ASTM standards may be ordered online at http://www.astm.org/ or from the ASTM International, 100 Barr Harbor Drive, Conshohocken, PA 19428-2959.)

INTERNATIONAL ORGANIZATION FOR STANDARDIZATION

ISO 14490-3 Optics and Optical Instruments – Test Methods for Telescopic Systems

ISO 14490-5 Optics and Optical Instruments - Test Methods for

Transmittance

SPORTING ARMS AND AMMUNITION MANUFACTURERS’ INSTITUTE

STANDARD (SAAMI)

ANSI/SAAMI-Z299.4 Voluntary Industry Performance Standards for

Pressure and Velocity of Centerfire Weapon Sporting Ammunition for the Use of Commercial Manufacturers

ANSI Z-136.1 Typical Laser Classification

ANSI N43.4-2005 Classification of Radioactive Self-Luminous Light Sources

SAMMI Technical Committee Manual Vol. IV, Shotshell SAAMI Technical Committee Manual Vol. VIII, Shotgun SAAMI Technical Committee Manual Vol. XI, Cartridges and Chambers (Copies of SAAMI standards may be ordered online at http://www.saami.org/)

2.4 Order of precedence

Unless otherwise noted herein or in contract, in the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.

http://www.saami.org/

3 REQUIREMENTS

a. Threshold The Threshold (T) requirement states the minimum performance level acceptable. If only one performance level is stated it is understood to be the threshold.

b. Objective

The Objective (O) requirement states a level of performance above the threshold level that is desired but not required for the material to be acceptable.

3.1 Optical Requirements

3.1.1 Magnification

The GSS magnification shall be unity (non-magnified) and shall be a reflex or holographic sight which transmits light from the target to the viewer.

3.1.2 Image Quality

The resolution when viewed through the central position of the GSS shall be better than or equal to 62 arc seconds. Vertical and horizontal lines shall be resolvable to within +/-0.125 diopters.

3.1.3 Surface Defects (scratch and dig)

The GSS lens’s substrate shall conform to a scratch and dig of 80-50 or better in accordance with

MIL-PRF-13830B.

3.1.4 Severe Abrasion

The GSS lens’s outer surfaces shall have no visible damage, such as evidence of abrasion or coating removal, to the coated surface when abraded with a coating, eraser abrasion tester conforming to DWG 7680606. The requirement shall be performed on substrate materials that have Knoop hardness greater than 450kg/mm2.

3.1.5 Transmission

3.1.5.1 Photopic

Photopic transmission through the optical sight shall be no less than 80%.

3.1.5.2 Near Infrared

Transmission for wavelength ranging from 700 to 900 nanometers shall average no less than 70% (T), 88% (O).

3.1.6 Aiming References

The GSS shall contain an encoded aiming reference or incremental aiming references that are numerically marked per corresponding ballistic range in increments of no greater than 10 meters.

The scales shall be configured to the ballistics of the firing tables for the M320 grenade launcher, as provided by the Government. Aiming references shall provide a ballistic scale spanning a range of no less than 50 meters to the effective range of all M320 ammunitions, including future and extended range ammunition. Linear interpolation shall be used for ranges that do not have provided elevation and windage values.

3.1.7 Elevation Angle

The GSS shall be capable of accommodating firing angles from zero up through and including 45 degrees (785.4 mrad).

3.1.8 Ballistic Solutions

3.1.8.1 Ballistic Configuration

Six ballistic solutions shall be provided encompassing the M433 and M781 ballistic tables (T), plus an additional nine solutions for future ammunition for a total of Fifteen (O)

3.1.8.2 Configuration Selector

3.1.8.2.1 Selector Interface

The GSS shall provide the user with the ability to select the appropriate ballistic solution for the weapon/ammunition configuration.

3.1.8.2.2 Pre-programmed Quick Selector

The GSS shall provide a selector that allows the User to instantaneously switch between two pre-programmed ballistic solutions without having to enter a menu program of any kind. The two pre-programmed ballistic solutions shall be capable of being pre-programmed by the User to any of the ballistic solutions stored within the GSS.

3.1.8.2.3 Selector Tools

The GSS user interface and quick selector shall not require the use of tools.

3.1.8.3 Updatability

3.1.8.3.1 Firing Tables

The GSS shall provide an interface to update the ballistic references stored in the device to facilitate the ballistics of future ammunition, weapon, and weapon configuration that may be employed with the grenade launcher. The GSS shall be updatable at the unit level without support outside of the US Army. If a computer is required to perform the update, software shall be compatible with the Maintenance Support Device Version 3 (MSD-V3) (Windows OS NSN 6625-01-592-6732) and conform to all US Army security protocols including achieving a certificate of networthiness (CoN) or Risk Management Framework (RMF) equivalent. If a wired port is required for updating, the GSS shall conform to RS-232 port standards and be compatible with the MSD-V3. If a separate data port is required for updating it shall be the same receptacle used in Data Transmission.

3.1.8.3.2 Firmware:

The GSS shall provide an updatable firmware stored in the device to allow for future defect corrections, enhancements, make adjustments to data export capabilities, and have the ability to modify the main application as needed. The firmware shall be updatable without support outside of the US Army; support environment shall be provided. The GSS shall provide a standard communication port for updating and shall conform to RS-232 port standards. The main application shall use a standard programing language; nonproprietary.

3.1.8.4 Data Transmission

The GSS shall provide a miniature combined auxiliary power and serial communication port for interface with an external device for data transmission. The interface port shall be easily accessible when the GSS is attached to the weapon in both underbarrel and stand alone configuration. Electrical and communication configuration shall be per Interface Control Document (ICD) for Weapon Mounted Ballistic Calculators and Micro Displays Rev B unless otherwise specified. Equivalent commercialy avalible data port receptical is optional provided it meets all environmental requirements, has an endurance of 10,000 mating cycles or better, and is approved by the Government authority. The GSS shall broadcast data in packets defined in table below to an external device, to include range (current range setting), atmospheric temperature, and barometric pressure. Packets with data reflecting current conditions shall broadcast in 250 millisecond intervals.

Message Byte

Index(s) Value (hex) Remarks 0-1 FF 85 Preamble of 0x85FF – Ballistic Calculator Specific Preamble 2-3 AE 2B Message Type ID – Airburst programmer message, 0x2BAE 4-5 00 00 Message Data Size = 102 bytes 6-7 00 00 Status Bits = 0x0000 8-9 xx xx Checksum for header (the header remains constant) 10-19 00 00 00 00 00 00 00 00 00

Unused

20-23 xx xx xx xx Range (CAPS SPFP) – meters 24-63 00 00 00 00 00 00 00 00 00

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

Unused

64-67 xx xx xx xx Atmospheric temperature (CAPS SPFP) – Celcius 68-71 xx xx xx xx Barometric pressure (CAPS SPFP) – hPa 72-109 00 00 00 00 00 00 00 00 00

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

Unused

110-111 xx xx Checksum for message

3.1.9 Reticle

An illuminated ballistic aiming pattern(s) shall be projected from the target to the viewer with the following characteristics:

3.1.9.1 Feature Size

Reticle(s) feature sizes shall be no less than 0.58 milliradian (2MOA) and no greater than 1.16 milliradians (4MOA) in line width or dot diameter.

3.1.9.2 Hue

The aiming reference shall appear red to the naked eye.

3.1.9.3 Reticle Visibility

All reticle patterns, in their entirety, shall be visible against a background luminance range of

0.03 to 17,100 candelas per square meter. The reticle shall also be visible when viewed through the AN/PVS-14 image intensifier system within its operational limits.

3.1.10 Night Capability

The GSS shall provide an IR aiming laser and IR floodlight for night engagement and shall provide 4 modes of operation: nonlaser, aiming laser low power only, dual operation aiming laser and illuminator low power, and dual operation aiming laser and illuminator high power.

3.1.10.1 Near Infrared Aiming Laser

The IR aiming laser shall have a range in quarter moon light conditions of a minimum of 200 meters. The aiming laser shall be, at low, a Class 3R laser defined as having a nominal ocular hazard distance (NOHD) of 26m or less IAW ANSI Z136.1-2014. The aiming laser shall be, at high, a Class 3B laser defined as having a nominal ocular hazard distance (NOHD) of 250m or less IAW ANSI Z136.1-2014. The illumination shall be detectable by currently available standard Image Intensifying Devices (e.g., Night Vision Goggles, etc.)

3.1.10.1.1 Output Power

The output power of the IR aiming laser shall be switch selectable for two levels of operation.

The Low power level shall be 0.6 milliwatts (+/-0.1 milliwatts) continuous. The High power level shall be 30 milliwatts (+/- 2.5 milliwatts) continuous and shall provide a mechanical lockout to prevent accidental selection.

3.1.10.1.2 Beam Divergence

The beam divergence of the aiming laser shall be 0.5 mrad (+/- 0.3 mrad). No hot spots or secondary beams will be detectable under any conditions.

3.1.10.1.3 Output Wavelength

The aiming laser shall have an output peak wavelength of 830 nm (+20, -10 nm) at an ambient temperature of 22 degrees C.

3.1.10.2 Near Infrared Illumination Laser

The illumination laser is an assembly utilized for infrared illumination of targets (T). The illuminator shall provide variable divergence (O). It shall have a range in quarter moon light conditions of a minimum of 200 meters. The illuminator laser shall be, at low, a Class 3R laser defined as having a nominal ocular hazard distance (NOHD) of 3m or less for fixed divergence and 55m or less for variable divergence IAW ANSI Z136.1-2014. The illuminator laser shall be, at high, a Class 3B laser defined as having a nominal ocular hazard distance (NOHD) of 60m or less IAW ANSI Z136.1-2014. The illumination shall be detectable by currently available standard Image Intensifying Devices (e.g., Night Vision Goggles, etc.)

3.1.10.2.1 Output Power

The output power of the illuminating laser shall be switch selectable for two levels of operation.

The Low power level shall be less than 3.5milliwatts continous. The High power level of the illuminating laser shall be 30 milliwatts (+/-6 milliwatts) continuous and shall provide a mechanical lockout to prevent accidental selection.

3.1.10.2.2 Beam Divergence

The beam divergence of the illuminating laser shall be 30 mrad (+/- 3 mrad) (T). The beam divergence of the illuminating laser shall be operator adjustable from 1 mrad to 105 mrad (O).

3.1.10.2.3 Output Wavelength

The illuminating laser shall have an output peak wavelength of 830 nm (+20, -10 nm) at ambient temperature of 22 degrees C.

3.1.10.3 Radiation Safety Markings

All laser safety labels shall be in accordance with MIL-STD-1425 “Laser Warning Labels”.

3.1.11 Survivability

3.1.11.1 Signature

All reticle patterns (and illuminated display) shall not be visible at a 10 meter distance from the target side of the sight, ± 45 degrees azimuthally from directly in front of the user, when viewed by the human/naked eye (T) or when using AN/PVS-14 3rd generation image intensifying night vision goggles (O). The GSS brightness shall be set, to be visible against a background luminance of 35 candelas per square meter.

3.1.11.2 Sound

The GSS shall not emit sound detectable by the human ear at a distance of 10 meters or greater in any direction while in use.

3.1.12 Power Source

Active or passive elements are acceptable provided all other requirements, especially “Reticle Visibility” are met. The illumination power source shall be either a battery (ies) (maximum of two (2) batteries required, one (1) battery desired) or passive element which:

3.1.12.1 Battery Type

If battery (ies) are used, battery (ies) shall be of the following: CR2032 Coin Cell or CR123 (T) or AA Size Battery (O). If standard consumer ‘AA’ size battery (ies) is used, the optic shall be capable to accept both lithium and alkaline compositions. Batteries shall NOT be rechargeable.

3.1.12.2 Run Time

The GSS shall provide power to execute a 96hrs mission in accordance with M320 OMS/MP.

While continuously suppling power specified in the Data Transmission ICD at typical current draw through the auxiliary port, the 96hrs mission OMS/MP shall not be degraded by more than 25%. Continuous power draw may be disabled during sleep.

3.1.12.3 Battery Composition.

Battery(ies) shall not contain mercury (Hg) or Zinc-Carbon.

3.1.12.4 Battery Replacement

The GSS power source utilizing battery(ies) shall be field replaceable without removing the GSS when mounted on the mounting adapter or MIL-STD-1913 compatible rail and shall not require the use of tools.

3.1.12.5 Battery Cover/Cap

The GSS power source utilizing battery(ies) shall contain a removable cover or cap that is attached to the unit so as to preclude its loss when removed from the optic.

3.1.12.6 Battery Set(s)

One (1) additional battery set for a total of two (2) battery sets shall be supplied and packed in the same box with each sight delivered. A set is defined as the total number of batteries necessary to operate the unit.

3.1.12.7 Sleep Mode

The GSS shall automatically enter into a sleep mode after 10 minutes ± 1 minute of not receiving an input from the user. The GSS shall come out of sleep mode and return back to its previous settings after receiving any input from the user. The following are considered user inputs:

adjusting range, selecting mode of operation, selecting ammo type, menu navigation button(s) / switch(s), and laser activation. The time to come out of sleep mode shall be no greater than the power up time stated in paragraph Power Up Time. Lasers shall be deactivated upon wake.

3.1.12.8 Incorrect Replacement

Incorrect replacement of the power source shall not degrade the performance of the GSS when the power source is removed then correctly replaced.

3.1.12.9 Polarity Markings

The GSS shall have polarity identification markings to assist in correctly installing the power source.

3.1.12.10 Power Up Time

The GSS shall have a power up time of no greater than 1.0 second (T), no greater than 100 ms

(O) when viewed against a background luminance of 3,426 Cd/m2 (1,000 foot-lambert).

3.1.12.11 Battery Life Indicator

The GSS shall indicate remaining battery life.

3.1.12.12 On/Off Mechanism

The GSS shall have a mechanism for turning the device on and off.

3.2 Attachment Requirements

3.2.1 Interface

3.2.1.1 Mounting

The GSS shall be capable of mounting to a MIL-STD-1913 without modification to the M320, M16A4 Rifle or the M4A1 carbines.

3.2.1.2 Special Tools

The mounting of the GSS shall not require the use of special tools (T) or any tools (O). Special tools are defined as tools not common to the Small Arms Repairman’s Tool kit (NSN 5180-00- 357-7770).

3.2.1.3 Ambidextrous

The GSS shall be capable of mounting on both sides of the M4A1 carbine forward rail to accommodate ambidextrous shooters (O).

3.2.1.4 Cant Indicator

The GSS shall provide a means of indicating cant at an angle of 2 degrees +/-1 degree in both directions when attached to the host weapon (T).

3.2.2 Compatibility

3.2.2.1 Back-up Sight.

The GSS shall be compatible with the M320 leaf sight or provide a back up sighting capability on the GSS.

3.2.2.2 Other Accessories

The GSS shall not interfere with the fitting or use of any of the currently issued weapons’ optical or illumination devices (for example: M68 CCO, PEQ-15/16, PEQ-2, PAQ-4) when attached in the underbarrel configuration. Optical and illumination devices for the weapon will be provided by the Government.

3.2.2.3 Adjustment

The line of sight shall be capable of being calibrated in the elevation and azimuth directions without the use of special tools (T), no tools (O). The GSS shall have a total movement of no less than the following: 20 milliradians in elevation (plus and minus 10 milliradians from position where aiming reference is centered on respective aiming reference) and 20 milliradians in azimuth (plus and minus 10 milliradians from position where aiming reference is centered on respective aiming reference) (T). The GSS shall use tactile controls with scales visible in daylight, in increments no greater than 0.5 milliradians (O) . The GSS shall be adjustable without removal from the weapon(T).

3.2.2.4 M320 Adapter

The GSS shall provide a M320 compatible mounting adapter for mounting the GSS directly above the M320 receiver in the stand alone configuration. The GSS while mounted to the M320

Adapter shall not overhang the M320 receiver in any direction, and must be compatible with the M320 leaf sight or back-up sight and buttstock.

3.3 Physical Requirements

3.3.1 Weight

The GSS, with batteries, shall weigh no greater than 11 ounces (T) no greater than 7.5 ounces (O).

3.3.2 Size (Volume)

The GSS, with batteries, shall be no greater than 16 cubic inches (T) no greater than 8 cubic inches (O).

3.3.3 Color

The GSS shall have an external color of approximately color no. 20150 (Coyote) but not lighter than color no. 20220 of FED-STD-595, except that gloss levels per flat finish shall apply.

3.3.4 Operability

3.3.4.1 Soldier Hand Protection

The sight and mount shall be operable and maintainable by 5th through 95th percentile male (stature) soldier wearing Mission Oriented Protective Posture IV (MOPP IV) protective gloves, cold weather protective clothing (excluding Arctic Mittens), and/or corrective lenses.

3.3.4.2 Sharp Edges

The sight and mount shall be free of sharp edges or other features that would preclude the Soldier’s optimal usage of the GSS or other systems either immediately or over time.

3.3.4.3 Hand Generated Forces

The sight and mount shall withstand hand generated forces (including twisting the housing) by the operator without breaking or degrading operational performance.

3.3.4.4 Switches

All switches or other operating controls (excluding azimuth and elevation adjustment) shall be operable from the normal firing positions by both right and left handed shooters.

3.3.4.5 Tools

The sight shall not require the use of tools to operate.

3.3.5 Marking

All marking shall comply with all terms and conditions of DFARS 252.211-7003, “Item Identification and Valuation.” The Unique Item Identifier must be applied IAW DFARS 252.211-7003. Marking requirements shall be IAW MIL-STD-129, Marking for Shipments and Storage” and MIL-STD-130, Identification Marking of US Military Property.”

3.3.6 Lens Cover

The GSS shall have a protective shield that is either integral to the GSS or removable and protects the GSS’s lens from external debris and contaminants when attached to the weapon.

The protective shield shall not interfere with the function of the weapon system (T).

3.3.7 Carrying Case

The GSS shall have a soft water resistant carrying case. The case shall provide space for the sight, mount(s), spare batteries, operator's manual, lens cleaning materials and quick reference card.

3.4 General Characteristic Requirements

3.4.1 Error Budget

For the requirements listed below, the cumulative total measured error shall not exceed 5 milliradians (T) 3.2 milliradians (O).

3.4.1.1 Ballistic Accuracy

The GSS elevation angle corresponding to range inputs shall be measured and compared to Government ballistic tables for each round type and configuration position. Only error in ballistic accuracy greater than 1 percent of superelevation shall contribute to the Error Budget Requirement.

3.4.1.2 Parallax

Parallax error is defined as angular displacement between target and reticle aiming feature at respective range when viewed by moving the eye across the exit aperture of the sight. Parallax shall be measured with targets set at 100m and 600m.

3.4.1.3 Applied Forces

All sight/mount configurations shall be capable of withstanding a load of 25 pounds of force in horizontal, vertical and longitudinal directions about the sight without signigicantly affecting the point of aim

3.4.1.4 Reattachment

The GSS shall retain zero, when dismounted and mounted on the same position on the MIL-STD compatible rail on the weapon.

3.4.1.5 Zero Retention

The GSS while continuously mounted in the underbarrel configuration shall maintain zero for three basic loads of 5.56mm and High Explosive Dual Purpose (HEDP) M433 40mm ammunition, for total of 639 5.56mm rounds and 108, 40mm rounds. In addition the following shall be observed: reticle illumination intensity setting shall not change and the battery cover shall not come loose.

3.4.2 Temperature and Pressure

The GSS shall provide ballistic atmospheric compensation for all ammunition tables stored in the GSS using intergrated sensors for temperature and barometric pressure. Atmospheric compensation and associated sensors shall be capable of being disabled by the User for ballistic solution at standard atmospheric conditions.

3.4.3 User in the Loop

3.4.3.1 Engagement Time

The User engagement time for the GSS with loaded M320 shall be no greater than the target exposure time specified in the M4 firing tables in FM 3-22.9.

3.4.3.2 User in the Loop Accuracy

The User in the loop accuracy for the GSS shall be equal to or greater than the M320/M320A1 with leaf sight, in all weapon configurations.

3.4.4 Technical Manual

The GSS will come with a MIL STD Technical Manual (TM) that includes but is not limited to, the following information:

3.4.4.1 Operator Maintenance/Cleaning Instructions

The GSS shall have easy to understand operator level maintenance manuals and cleaning instructions to execute operator maintenance.

3.4.4.2 Zeroing Instructions

The GSS shall come with readily available instruction to zero the optic to the weapon. Zeroing instructions shall be available for both the underbarrel configuration and standalone configuration.

3.4.4.3 Boresight/Zero Targets

The GSS technical manual shall come with targets with appropriate offsets to ensure proper boresight zero of the GSS.

3.4.4.4 Updating Instructions

The GSS shall come with easy to understand instructions for updating ballistic firing tables stored in the GSS. If software is used, the manual shall also provide instructions for using and navigating the software.

3.4.5 Reliability

The GSS shall demonstrate the following reliability requirement while attached in both the standalone and underbarrel configurations. NOTE: The 40mm low velocity round included in the reliability requirement will consist of M781 and M433 intended to be fired through the M320 GL. The maximum recoil energy of any round will be limited to 40 ft-lbf recoil energy when fired through a M320 in the stand alone configuration.

3.4.5.1 MRBEFF for Class III

The GSS shall demonstrate 1,500 mean rounds between essential function failure (MRBEFF) for Class III malfunctions (i.e. non-operator correctable malfunctions which cause the loss of essential GSS functionality).

3.4.5.2 MRBEFF for Class I & II

The GSS shall demonstrate 200 MRBEFF for Class I & II malfunctions combined [Class I malfunctions are operator correctable within 10 seconds, whereas Class II malfunctions require more than 10 seconds to be corrected by the operator with available equipment (Tool Kit, Small Arms Repairman NSN: 5180-00-257-7770)].

3.4.6 Environmental

The GSS, mount and lens/dust covers shall be capable of withstanding the following environments without physical damage and without any degradation of the performance characteristics (optical, attachment, physical, and general).

3.4.6.1 Drop

The GSS shall be able to sustain no physical damage and degradation of performance when dropped five (5) times from a height of two (2) feet. Bore sight retention shall be no greater than 1 milliradian (T), 0.5 milliradian (O) after the completion of Drop.

3.4.6.2 Transportation Vibration

The GSS attached in the underbarrel configuration, shall perform as specified herein and show no indication of damage after experiencing:

3.4.6.2.1 Loose Cargo Transportation

The GSS attached in the underbarrel configuration shall show no indication of damage after experiencing a package tester vibration.

Or

3.4.6.2.2 Large Assembly Transport

The GSS attached in the underbarrel configuration shall show no indication of damage after experiencing a test surface(s) and vehicle(s) representative of transportation and/or service phases of the environmental life.

3.4.6.3 Sealing

The GSS shall remain watertight and operational with no evidence of damage or performance degradation after immersion in one (1) meter (3.3 feet) of ambient temperature water for thirty

(30) minutes (T) or immersion in twenty (20) meters (66 feet) of ambient temperature water for one (1) hour (O).

3.4.6.4 Operational Temperature

3.4.6.4.1 Operational Hot Temperature

The GSS shall remain operational, with no evidence of damage or performance degradation, on battery power, while being exposed to the following temperature: +48.9˚C (+120˚F) (T) or +60˚C (+140˚F) (O) for no less than four (4) hours.

3.4.6.4.2 Operational Cold Temperature

The GSS shall remain operational, with no evidence of damage or performance degradation, on battery power, while being exposed to the following temperatures: -28.9˚C (-20˚F) (T) or -40˚C (-40˚F) (O) for no less than four (4) hours.

3.4.6.5 Storage Temperature

3.4.6.5.1 Storage Hot Temperature

The GSS shall remain operational with no evidence of damage or performance degradation after having been exposed to the following temperature: +60˚C (+140˚F) (T) or +71.1˚C (+160˚F) (O) for no less than four (4) hours.

3.4.6.5.2 Storage Cold Temperature

having been exposed to the following temperature -40˚C (-40˚F) (T) or -45.6˚C (-50˚F) (O) for no less than four (4) hours.

3.4.6.6 Humidity

The GSS shall remain operational with no evidence of damage or performance degradation after having been exposed to an atmosphere of 120 degrees +/- 4 degrees F (48.9 degrees +/- 2 degrees C) and 95 to 100% relative humidity.

3.4.6.7 Thermal Shock

being exposed to one temperature shock cycle.

3.4.6.8 Salt Fog

The GSS shall be safe to handle and be fully operable after a minimum of forty-eight (48) hours of salt fog exposure.

3.4.6.9 Chemical Compatibility Testing

The GSS shall be compatible with Army standard chemicals listed below:

NSN 6850-00-965-2332 Carbon Removing Compound MIL-PRF-372 Cleaning Compound, Solvent (For Bore of Small Arms and Automatic Aircraft Weapons) MIL-PRF-14107 Lubricating Oil, Weapons, Low Temperature MIL-G-21164 Grease, Molybdenum Disulfide, For Low and High

Temperatures, NATO Code Number G-353 MIL-L-46000 Lubricant, Semi-Fluid (Automatic Weapons) MIL-PRF-63460 Lubricant, Cleaner, and Preservative for Weapons and

Weapons Systems

3.4.6.10 Sand and Dust

The GSS with mounting bracket shall remain operational with no evidence of damage or performance degradation when subjected Sand and Dust with the lens cover on and powered down.

3.4.6.11 Electromagnetic Environmental Effects (E3)

All components of the GSS shall be functional during and after the following E3 subtests:

3.4.6.11.1 Personnel Electrostatic Discharge (PESD)

The GSS shall be functional after being subjected to Personnel Electrostatic Discharge (PESD) as specified in TOP 1-2-511 and MIL-STD-464.

3.4.6.12 Airborne Operations

The GSS, in standalone and underbarrel configurations, shall show no evidence of degradation of operational and safety performance, and shall operate upon completion of Static Impact Airdrop Testing, Military Free Fall (MFF) and Static Line (SL) airborne operations.

3.4.7 Workmanship

Workmanship shall be of a quality consistent with the highest existing instrument production standards and practices. All finished surfaces shall be protected against corrosion or damage during manufacturing prior to delivery. All fins and other excess material shall be removed from castings and forgings. All surfaces, including threads, shall be free from burrs and sharp edges.

All material shall be sound, of uniform quality and condition, and free from seems, cracks and other defects which may adversely affect the strength, to all assemblies, especially where required for proper sealing and security. Material shall not be treated in any manner to conceal defects therein. Welding or other means for the repair of defects in materials shall not be performed unless specifically authorized by the contracting officer. In addition, the provisions of MIL-HDBK-454, Guideline 9 shall apply where applicable. Workmanship shall be as specified in MIL-F-13926B.

3.5 Radioactive Material Requirements

3.5.1 License

Should radioactive material be used as a power source, a Nuclear Regulatory Commission (NRC) exemption license shall be provided.

3.5.2 Contamination Limits

3.5.2.1 Wipe Limit

The sight assembly shall not exceed 100 disintegrations per minute over background.

Determination procedure shall be as specified in section 4.

3.5.2.2 Radioactive Leakage

The sight assembly shall not exceed diffusing 50 nanocuries per day. Determination procedures shall be as specified in section 4.

3.5.3 Radiation/Safety Marking

Each sight shall be identified with a serial number. Radioactive marking and labeling shall be as specified in MIL-STD-129, except as follows: each sight shall be marked in a conspicuous location with radioactive symbol, the isotope, activity, and date of activity determination (month and year). Abbreviations may be used for the isotope tritium, H3, and activity, such as mCi for millicuries.

3.5.4 Additional Environmental Tests

Each sight is required to pass the following tests of ANSI N43.4 “Classification of Radioactive Self-luminous Light Sources “ in addition to the other tests above:

3.5.4.1 Pressure (Reduced) (7.5)

The GSS shall be subject to ANSI N43.4 Classification of Radioactive Self-luminous Light 7.5 Pressure (reduced) test and evaluation.

3.5.4.2 Impact (7.6)

The GSS shall be subject to ANSI N43.4 Classification of Radioactive Self-luminous Light 7.6 Impact test and evaluation.

3.5.4.3 Immersion (7.8)

The GSS shall be subject to ANSI N43.4 Classification of Radioactive Self-luminous Light 7.8 Immersion test and evaluation.

3.5.4.4 Evaluation (8)

The GSS shall be subject to ANSI N43.4 Classification of Radioactive Self-luminous Light 8 Evaluation test and evaluation.

4 VERIFICATION

Table I. Requirement/Verification Cross-Reference Matrix

METHODS OF

VERIFICATION

CLASSES OF

VERIFICATION

N/A – Not Applicable A – Design verification 1 – Analysis B – First article inspection 2 – Demonstration C – Conformance inspection 3 – Examination 4 – Test

Section 3 Requirement Verification Method Verification

Class Section 4

N/A 1 2 3 4 A B C Magnification 3.1.1 x x x x 4.1.1 Image Quality 3.1.2 x x x x 4.1.2 Surface Defects 3.1.3 x x x x 4.1.3 Severe Abrasion 3.1.4 x x x 4.1.4 Photopic 3.1.5.1 x x x x 4.1.5.1 Near Infrared 3.1.5.2 x x x x 4.1.5.2 Aiming Reference 3.1.6 x x x x 4.1.6 Elevation Angle 3.1.7 x x x x 4.1.7

Class Section 4

N/A 1 2 3 4 A B C Ballistic Configuration

3.1.8.1 x x x x 4.1.8.1

Selector Interface 3.1.8.2.1 x x x x 4.1.8.2.1 Pre-programmed Quick Selector

3.1.8.2.2 x x x x 4.1.8.2.2

Selector Tools 3.1.8.2.3 x x x x 4.1.8.2.3 Firing Tables 3.1.8.3.1 x x x x 4.1.8.3.1 Firmware 3.1.8.3.2 x x x x 4.1.8.3.2 Data Transmission 3.1.8.4 x x x 4.1.8.4 Feature Size 3.1.9.1 x x x x 4.1.9.1 Hue 3.1.9.2 x x x x 4.1.9.2 Reticle Visibility 3.1.9.3 x x x x 4.1.9.3 Night Capability 3.1.10 x x x x 4.1.10 Near Infrared Aiming Laser

3.1.10.1 x x x x 4.1.10.1

Output Power 3.1.10.1.1 x x x x 4.1.10.1.1 Beam Divergence 3.1.10.1.2 x x x x 4.1.10.1.2 Output Wavelength 3.1.10.1.3 x x x x 4.1.10.1.3 Near Infrared Illumination Laser

3.1.10.2 x x x x 4.1.10.2

Output Power 3.1.10.2.1 x x x x 4.1.10.2.1 Beam Divergence 3.1.10.2.2 x x x x 4.1.10.2.2 Output Wavelength 3.1.10.2.3 x x x x 4.1.10.2.3 Radiation Safety Markings

3.1.10.3 x x x x 4.1.10.3

Signature 3.1.11.1 x x x 4.1.11.1 Sound 3.1.11.2 x x x 4.1.11.2 Power Source 3.1.12 x x x 4.1.12 Battery Type 3.1.12.1 x x x x 4.1.12.1 Run Time 3.1.12.2 x x x 4.1.12.2 Battery Composition

3.1.12.3 x x x 4.1.12.3

Battery Replacement

3.1.12.4 x x x 4.1.12.4

Battery Cover/Cap 3.1.12.5 x x x x 4.1.12.5 Battery Set(s) 3.1.12.6 x x x x 4.1.12.6 Sleep Mode 3.1.12.7 x x x 4.1.12.7

Class Section 4

N/A 1 2 3 4 A B C Incorrect Replacement

3.1.12.8 x x x 4.1.12.8

Polarity Markings 3.1.12.9 x x x x 4.1.12.9 Power Up Time 3.1.12.10 x x x 4.1.12.10 Battery Life Indicator

3.1.12.11 x x x x 4.1.12.11

On/Off Mechanism 3.1.12.12 x x x x 4.1.12.12 Mounting 3.2.1.1 x x x x x 4.2.1.1 Special Tools 3.2.1.2 x x x 4.2.1.2 Ambidextrous 3.2.1.3 x x x x 4.2.1.3 Cant Indicator 3.2.1.4 x x x x x 4.2.1.4 Back-up-Sight 3.2.2.1 x x x x 4.2.2.1 Other accessories 3.2.2.2 x x x 4.2.2.2 Adjustment 3.2.2.3 x x x x 4.2.2.3 M320 Adaptor 3.2.2.4 x x x x 4.2.2.4 Weight 3.3.1 x x x 4.3.1 Size (Volume) 3.3.2 x x x 4.3.2 Color 3.3.3 x x x x 4.3.3 Soldier Hand Protection

3.3.4.1 x x x 4.3.4.1

Sharp Edges 3.3.4.2 x x x 4.3.4.2 Hand Generated Forces

3.3.4.3 x x x x 4.3.4.3

Switches 3.3.4.4 x x x x 4.3.4.4 Tools 3.3.4.5 x x x 4.3.4.5 Marking 3.3.5 x x x x 4.3.5 Lens Cover 3.3.6 x x x x 4.3.6 Carrying Case 3.3.7 x x x x 4.3.7 Error Budget 3.4.1 x x x x 4.4.1 Ballistic Accuracy 3.4.1.1 x x x x 4.4.1.1 Parallax 3.4.1.2 x x x x 4.4.1.2 Applied Forces 3.4.1.3 x x x x 4.4.1.3 Reattachment 3.4.1.4 x x x x 4.4.1.4 Zero Retention 3.4.1.5 x x x x 4.4.1.5 Temperature and Pressure

3.4.2 x x x 4.4.2

Engagement Time 3.4.3.1 x x 4.4.3.1

Class Section 4

N/A 1 2 3 4 A B C User In The Loop Accuracy

3.4.3.2 x x 4.4.3.2

Technical Manual 3.4.4 x x x x x 4.4.4 Operator Maintenance / Cleaning Instructions

3.4.4.1 x x x x 4.4.4.1

Zeroing Instructions

3.4.4.2 x x x x 4.4.4.2

Boresight/Zero Targets

3.4.4.3 x x x x 4.4.4.3

Updating Instructions

3.4.4.4 x x x x 4.4.4.4

MRBEFF for Class

III

3.4.5.1 x x x 4.4.5.1

MRBEFF for Class

I & II

3.4.5.2 x x x 4.4.5.2

Drop 3.4.6.1 x x x 4.4.6.1

Loose Cargo Vibration

3.4.6.2.1 x x x 4.4.6.2.1

Large Assembly Transport

3.4.6.2.2 x x x 4.4.6.2.2

Sealing 3.4.6.3 x x x x 4.4.6.3 Operational Hot Temperature

3.4.6.4.1 x x x x 4.4.6.4.1

Operational Cold Temperature

3.4.6.4.2 x x x x 4.4.6.4.2

Storage Hot Temperature

3.4.6.5.1 x x x x 4.4.6.5.1

Storage Cold Temperature

3.4.6.5.2 x x x x 4.4.6.5.2

Humidity 3.4.6.6 x x x 4.4.6.6 Thermal Shock 3.4.6.7 x x x 4.4.6.7 Salt Fog 3.4.6.8 x x x 4.4.6.8 Chemical Compatibility Testing

3.4.6.9 x x 4.4.6.9

Sand and Dust 3.4.6.10 x x x 4.4.6.10

Class Section 4

N/A 1 2 3 4 A B C Personnel Electrostatic Discharge (PESD)

3.4.6.11.1 x x x 4.4.6.11

Airborne Operations

3.4.6.12 x x 4.4.6.12

Workmanship 3.4.7 x x x x 4.4.7 License 3.5.1 x x x x 4.5.1 Wipe Limit 3.5.2.1 x x x 4.5.2.1 Radioactive Leakage

3.5.2.2 x x x 4.5.2.2

Radiation/safety Marking

3.5.3 x x x 4.5.3

Pressure (Reduced) 3.5.4.1 x x x 4.5.4.1 Impact 3.5.4.2 x x x 4.5.4.2 Immersion 3.5.4.3 x x x 4.5.4.3 Evaluation 3.5.4.4 x x x 4.5.4.4

V/M/S- Visual, Manual, Standard Measuring and Test Equipment. “V/M/S” is when requirement compliance can be readily determined through visual and manual examinations or simple measurement techniques utilizing Standard Measuring and Test Equipment (SMTE) as defined in “Inspection Methods” of MIL-W-63150 “Weapons and Support Materiel, Standard Quality Assurance Provisions for”. All standard measuring and test equipment shall be calibrated with traceability to National Institute of Standards and Technology (NIST) and shall have enough precision to measure an order of magnitude greater than the tolerances specified in section 3.

4.1 Optical Verification

4.1.1 Magnification

Compliance shall be verified thorough visual and manual examination.

4.1.2 Image Quality

The GSS shall be tested in accordance with MIL-PRF-13830B 4.2.5 Resolution test or better method.

4.1.3 Surface Defects (scratch and dig)

The GSS’s lenses shall be inspected and compared against scratch and dig standards as specified in MIL-PRF-13830B, 3.5.

4.1.4 Severe Abrasion

The coated components, or witness piece, shall be subjected to a severe abrasion as specified in MIL-PRF-13830B C.4.5.10 Severe abrasion.

4.1.5 Transmission

4.1.5.1 Photopic

The Photopic transmission of the GSS shall be measured in accordance with ISO 14490-5 Test methods for Transmittance.

4.1.5.2 Near Infrared

The transmission for wavelength ranging from 700nm to 900nm shall be measured in accordance with ISO 14490-5 Test methods for Transmittance.

4.1.6 Aiming References

Compliance shall be verified through visual and manual examination.

4.1.7 Elevation Angle

Compliance shall be verified through standard measuring and test equipment.

4.1.8 Ballistic Solutions

4.1.8.1 Ballistic Configuration

4.1.8.2 Configuration Selector

4.1.8.2.1 Selector Interface

Compliance shall be verified through visual and manual examination.

4.1.8.2.2 Pre-programmed Quick Selector

Compliance shall be verified through visual and manual examination.

4.1.8.2.3 Selector Tools

4.1.8.3 Updatability

4.1.8.3.1 Firing Tables

Government generated tables shall be loaded into the GSS and measured for compliance.

4.1.8.3.2 Firmware

The GSS’s main application shall be updated though the communication port.

4.1.8.4 Data Transmission

The GSS shall be tested for conformance to specified power requirements under unloaded and loaded condition by verification of voltage levels using standard measuring equipment. Serial hardware configuration and data content shall be verified for compliance to inquiry commands for range to target, atmospheric pressure, and barometric data using an RS-232 terminal host.

The interface port shall also be checked for accessibility when the GSS is mounted to the weapon in under barrel and standalone configuration.

4.1.9 Reticle

4.1.9.1 Feature Size

For actively illuminated features compliance shall be verified using a laser beam analyzer. For passive features a measuring autocollimator shall be used.

4.1.9.2 Hue

4.1.9.3 Reticle Visibility

Using a uniform light source with a tungsten filament operated at color temperature 2856K +/- 50K; verify reticle markings visibility at 17,000 +/-2% candelas per square meter. In addition verify reticle markings visibility of the image using the AN/PVS-14, with a background luminance of 0.03 candelas per square meter. Measure the reticle luminance at 0.03 candelas per square meter and verify compliance with AN/PVS-14 operational limits.

4.1.10 Night Capability

4.1.10.1 Near Infrared Aiming Laser

Compliance shall be verified through standard measuring and test equipment. NOHD shall be verified mathematically using ANSI Z136.1-2014.

4.1.10.1.1 Output Power

Compliance shall be verified with an appropriate radiometer.

4.1.10.1.2 Beam Divergence

Compliance shall be verified with a laser beam analyzer.

4.1.10.1.3 Output Wavelength

Compliance shall be verified with a spectroradiometer.

4.1.10.2 Near Infrared Illuminator Laser

Compliance shall be verified through standard measuring and test equipment. NOHD shall be verified mathematically using ANSI Z136.1-2014.

4.1.10.2.1 Output Power

Compliance shall be verified with an appropriate radiometer.

4.1.10.2.2 Beam Divergence

Compliance shall be verified with a laser beam analyzer.

4.1.10.2.3 Output Wavelength

Compliance shall be verified with a spectroradiometer.

4.1.10.3 Radiation safety Markings

4.1.11 Survivability

4.1.11.1 Signature

The GSS’s reticle shall be adjusted to be visible when viewed against a uniform light source with a tungsten filament operated at color temperature 2856K +/- 50K background set to 35 +/-2% candelas per square meter. Using the human/naked eye, in a dark room, verify that the reticle pattern and display are not visible from the target side of the GSS at ± 45 degrees azimuthally from 10 meters.

4.1.11.2 Sound

This test shall be conducted in accordance with MIL-STD-1474, Requirement 2. In an anechoic or hemi-anechoic chamber, a microphone shall be positioned 1.2 meters above the ground at a distance of 2 meters from the GSS. The GSS shall index through every function and feature available, including target acquisition and night time features. Noise level will be recorded and shall not exceed the nondetectability limits listed in Table 2-II of MIL-STD-1474.

4.1.12 Power Source

4.1.12.1 Battery Type

4.1.12.2 Run Time

The GSS shall be active no less than 344.76 minutes of continuous run time in which the IR lasers will be actuated 43 times (on the highest setting) for no less than 10 seconds per actuation.

“Sufficient capacity” is defined as remaining visible with a background scene luminance of 3,426 Cd/m2 (1,000 foot-lambert).

4.1.12.3 Battery Composition

Compliance shall be verified through visual and manual examination.

4.1.12.4 Battery Replacement

The GSS shall be mounted to the MIL-STD-1913 rail and the battery shall be replaced without tools and without removing the GSS from its mounted position. This procedure shall be repeated for every mounting configuration including the adaptor.

4.1.12.5 Battery Cover/Cap

4.1.12.6 Battery Set(s)

Compliance shall be verified through visual and manual examination.

4.1.12.7 Sleep Mode

The GSS shall be turned on and allowed to enter sleep mode. The time taken to enter sleep mode shall be measured along with the time taken to “wake up” from a user input. All inputs shall be checked. Wake mode shall be measured in the same way as power up time (see paragraph Power Up Time).

4.1.12.8 Incorrect Replacement

Battery (ies) shall be installed backwards for no less than five (5) minutes. GSS shall attempt power on. Reinstall battery (ies) correctly and verify the GSS works properly through visual and manual examination.

4.1.12.9 Polarity Markings

4.1.12.10 Power Up Time

Determine the optimal brightness setting of the reticle to obtain visibility when viewed against a 3,526 candelas per square meter background. Measure and record the luminance of the reticle using standard optical measuring procedures and equipment. Using a photo detector and push button actuator if necessary, have an automated system that can determine the time span between the physical power actuation and reticle radiance/luminance that was previously measured.

4.1.12.11 Battery Life Indicator

4.1.12.12 On/Off Mechanism

4.2 Attachment Verification

4.2.1 Interface

4.2.1.1 Mounting

Compliance shall be verified through visual and manual examination.

4.2.1.2 Special Tools

Compliance shall be verified through visual and manual examination.

4.2.1.3 Ambidextrous

4.2.1.4 Cant Indicator

4.2.2 Compatibility

4.2.2.1 Back Up Sight

Compliance shall be verified through demonstrating full system functionality of the M320 leaf sight or the GSS backup sight while the GSS is mounted in both the underbarrel and standalone configurations.

4.2.2.2 Other Accessories

With the GSS mounted in the underbarrel configuration shall demonstrate full system functionality with all accessories installed per PD requirement “Other Accessories.”

4.2.2.3 Adjustment

With the GSS fixed to a ridged mount and using a measuring autocollimator, measure the full articulation of the elevation and azimuth zero dial and the incremental movement of them as specified in section 3.