Attachment_0006_-_MIL-PRF-32316_(AR).pdf

MIL-PRF-32316 (AR)

7 October 2008

PERFORMANCE SPECIFICATION

RIFLE, 7.62MM : SEMI-AUTOMATIC SNIPER SYSTEM (SASS) - M110

This specification is approved for use by the U.S. Army Armaments Research, Development and Engineering Center (ARDEC) and is available for use by all

Departments and Agencies of the Department of Defense.

1 SCOPE

1.1 Scope. This specification defines the technical and performance requirements, and the associated quality assurance provisions and verification procedures for the RIFLE, 7.62MM:

semi-automatic sniper system (SASS), M110. This specification states requirements for components identified in Section 6.7, hereafter referred to simply as SASS.

1.2 Type-designator. The Army type-designator M110 referenced in this specification is of Army origin and does not reflect a particular design. (See 6.4).

1.3 Requirement levels. This specification lists two values for certain performance parameters. The threshold value (T) is the minimum acceptable value, and the objective value

(O) is the desired value for which the performance of the M110 results in operationally significant increase in capabilities. All requirements not noted are threshold requirements.

1.4 Component designation. This specification contains four component requirement designations: System requirements, Rifle requirements, Day optical sight requirements, and System case requirements. Unless otherwise specified the system requirements apply to the rifle, the optic sight, and the carrying case. Unless otherwise specified the rifle requirements apply to the rifle only, the optic sight requirements apply to the sight only, and the system case requirements apply to the case only.

AMSC N/A FSC 1005

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

INCH-POUND

Comments, suggestions, or questions on this document should be addressed to Commander ARDEC, ATTN: AMSRD-AAR-QES-E, Picatinny, NJ 07806-5000) or emailed to (ardecstdzn@conus.army.mil).

Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at http://assist.daps.dla.mil.

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2 APPLICABLE DOCUMENTS

2.1 General. The documents listed in this section are specified in sections 3 or 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

TT-C-490 Chemical Conversion Coatings and Pretreatments for Ferrous Surfaces (Base for Organic Coatings)

DEPARTMENT OF DEFENSE SPECIFICATIONS

MIL-PRF-3150 Lubricating Oil, Preservative, Medium MIL-PRF-13830 Optical Components for Fire Control Instruments; General

Specification Governing the Manufacture, Assembly, and Inspection of

MIL-PRF-14107 Lubricating Oil, Weapons, Low Temperature MIL-DTL-16232 Phosphate Coating, Heavy, Manganese or Zinc Base MIL-PRF-63460 Lubricant, Cleaner and Preservative for Weapons and Weapon

Systems

DEPARTMENT OF DEFENSE STANDARDS

MIL-STD-130 Identification Marking of U.S. Military Property MIL-STD-461 Requirements for the Control of Electromagnetic Interference

Characteristics of Subsystems and Equipment MIL-STD-464 Electromagnetic Environmental Effects Requirements for Systems MIL-STD-810E Environmental Engineering Considerations and Laboratory Tests MIL-STD-810F Environmental Engineering Considerations and Laboratory Tests MIL-STD-1474 Noise Limits MIL-STD-1913 Dimensioning of Accessory Mounting Rail for Small Arms

Weapons MIL-STD-1916 DOD Preferred Methods for Acceptance of Product

DEPARTMENT OF DEFENSE HANDBOOKS

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MIL-HDBK-759 Human Engineering Design Guidelines

(Copies of these documents are available online at http://assist.daps.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111- 5094.)

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.

ARMY REGULATION

AR 70-38 Research, Development, Test and Evaluation of Materiel for Extreme Climatic Conditions

AR 70-75 Survivability of Army Personnel and Materiel

(Army Regulations may be viewed and printed http://www.apd.army.mil/.)

ARMY FIELD MANUAL

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

(Copies of these Field Manuals are available from the General Davis J. Reimer Training and Doctrine Digital Library at http://www.adtdl.army.mil/)

US ARMY DEVELOPMENTAL TEST COMMAND

TOP 1-2-511 Electromagnetic Compatibility Requirements, Systems Testing TOP 3-2-045 Automatic Weapons, Machine Guns, and Hand and Shoulder

Weapons TOP 3-2-504 Safety Evaluation of Hand and Shoulder Weapons TOP 3-2-609 Chemical Compatibility of Nonmetallic Materials Used In Small

Arms Systems

(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.)

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.

ASTM INTERNATIONAL

ASTM E 1444 Standard Practice for Magnetic Particle Testing

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(Copies of ASTM standards are available online from http://www.astm.org/ or from the American Society for Testing and Materials, 100 Barr Harbor Drive, Conshohocken, PA 19428-2959)

2.4 Order of precedence. Unless otherwise noted herein or in the 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.

3 REQUIREMENTS

3.1 Design verification. When specified (see 6.2), a sample of SASS shall be subjected to design verification in accordance with Table I and 4.2.

3.2 First article inspection. Unless otherwise specified (see 6.2), a sample of SASS shall be subjected to first article inspection in accordance with Table I and 4.3.

3.3 Conformance inspection. Unless otherwise specified (see 6.2), a sample of SASS shall be subjected to quality conformance inspection in accordance with Table I and 4.4.

3.4 Operating requirements.

3.4.1 System requirements.

3.4.1.1 Accuracy/dispersion. After the optic sight is zeroed, the accuracy and dispersion of the SASS shall meet the following:

3.4.1.1.1 Accuracy. . The distance between the mean point of impact of each shot group, both unsuppressed and suppressed, shall be not greater than 1.1 inches at 300 feet. The distance between the mean point of impact of the combined unsuppressed shot groups and the combined suppressed shot groups shall not be greater than 3.14 inches at 300 feet.

3.4.1.1.2 Dispersion. The average mean radius (AMR) (see 6.11), of each shot group shall be not greater than to 0.68 inches at 300 feet. All targets shall be fired on using M118LR ammunition or equivalent, using five (5) round groups.

3.4.2 Rifle requirements.

3.4.2.1 High pressure resistance. After the proof firing of one standard Cartridge, 7.62 MM, NATO, Test, High Pressure, M60, the barrel, bolt and receiver shall be free of cracks.

3.4.2.2 Rifle action. The rifle action shall be semi-automatic (see 6.11).

3.4.2.3 Safety.

a. The rifle shall have a safety mechanism that has the following characteristics:

1. It prevents the weapon from being fired when the trigger is depressed with the safety in the “SAFE” position.

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2. It is capable of being checked by both sight and touch

3. It is movable between the safe and fire positions by the operator without moving his hands from the shooting position (prone, standing, kneeling, and sitting).

4. It remains in the position the operator sets it until it is manually changed.

5. It requires a force of not less than 2 or greater than 10 pounds to operate.

6. It is operable by the 5th to the 95th percentile soldier, as specified in MIL-HDBK-

759, while dressed in environmental protective clothing.

b. The design of the rifle shall preclude firing while the bolt is not in the closed and locked position, or when the bolt is being closed.

3.4.2.4 Suppressor. The rifle shall incorporate an integrated acoustic, flash and blast suppressor that can be attached and detached by the operator by hand or with the tools common to the snipers’ deployment kit. The suppressor, when attached to the rifle, shall not shift the mean point of impact of rounds fired, when compared to firing unsuppressed, by not greater than

3.14 inches at 300 feet.

3.4.2.5 Recoil. The rifle recoil energy shall be not greater than 18 foot-pounds.

3.4.3 Day optical sight requirements.

3.4.3.1 Elevation and windage adjustment. Elevation and windage adjustments shall be provided with the following characteristics:

a. Clearly marked graduations that provide tactile feedback during movement.

b. The zero position of the reticle shall move not more than 0.55 minutes of angle

(MOA) from the optical axis when cycled from zero (0) to the extreme adjustments and returned.

c. Provide for visible and tactile setting adjustment indication.

d. The maximum tactile (click) increment for elevation and windage adjustment shall be

0.5 MOA.

3.4.3.2 Elevation and windage range. After the rifle is zeroed on the target with the day optic sight, there shall be not less than 15 MOA of windage adjustment (in both the left and right directions) and sufficient elevation adjustment to engage targets at 2,624.66 feet (800 meters) (T), 3,280.83 feet (1,000 meters) (O).

3.4.3.3 Reticle. The day optical sight shall be provided with the following characteristics:

a. A scaled, cross hair reticle with one-mil increment hashes, bisected by smaller half mil hashes.

b. The outer edge of the reticle shall have a single mil divided by 0.2 mil hashes.

c. An illuminated, improved Mil-Dot reticle powered by Army common/standard batteries.

d. Glass etched milling reticle.

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3.4.3.4 Parallax and focus adjustment. The day optical sight shall incorporate a focus/parallax adjustment located in the vicinity of the elevation and windage adjustments.

3.4.3.5 Parallax. Parallax shall be operator adjustable. For a target at 2,624.66 feet (800 meters) (T), 3,280.83 feet (1,000 meters) (O), parallax when viewed by moving the eye horizontally across the exit aperture of the sight, shall not exceed 15 seconds of arc at the center of the reticle when the parallax setting is properly adjusted.

3.4.3.6 Eyepiece focus. The eyepiece shall be operator adjustable from plus (+) 1 to minus (-) 2 diopters from the position of best focus on the reticle surface.

3.4.3.7 Objective opening. The objective end of the day optical sight shall have an internally threaded interface for accepting a laser filter unit (LFU) Tactical Rifle Scopes, 40mm (NSN 1240-01-537-6985) and other ancillary equipment.

3.4.3.8 Magnification. The day optical sight shall have a variable range of magnification. The lowest power parameter settings shall be no less than 3x and no greater than 4.5x and the highest power parameter setting shall be no less than 10x and no greater than 16x.

3.4.3.8.1 Power zero retention. The day optical sight shall have variable/adjustable power and shall retain zero throughout all power settings. The day optical sight shall be easy to operate by the 5th to 95th percentile target audience soldier, as specified in MIL-HDBK-759, while dressed in environmental protective clothing.

3.4.3.9 Resolution. At the highest magnification, resolution shall be not less than 6.5 arc seconds using a 4-6x dioptometer. Vertical and horizontal lines shall be resolvable to within

0.5 diopters.

3.4.3.10 Ballistic compensation. The day optical sight shall incorporate a bullet drop compensator (BDC) ballistically matched to the M118LR anti-personnel round and shall not preclude the application of “come up” data (recorded ballistic data) for the firing of other ammunition.

3.4.3.11 Field of view. At the highest magnification, field of view (FOV) shall be not less than two degrees.

3.4.3.12 Exit pupil diameter. At the highest magnification, the exit pupil diameter shall be not less than 0.16 inches (4mm).

3.5 Interface and interoperability requirements.

3.5.1 System requirements.

3.5.1.1 Weight. The rifle, complete with suppressor, bipod, MIL-STD-1913 rails, day optical sight, sling, and a 10 round magazine (unloaded) shall weigh no more than 16 pounds.

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3.5.1.2 Special tools. The SASS shall be capable of being easily disassembled into components for non-firing tactical carry and transportation and storage without the use of special tools (T), without any tools (O).

3.5.1.3 Exterior surfaces. The SASS surfaces shall be dull/non-reflective. This includes all surfaces (i.e. pins, bolts, lanyards, sight posts, etc.). The external color shall be tan, gray-green, gray or taupe to accommodate various camouflage combinations.

3.5.2 Rifle requirements.

3.5.2.1 Length. The maximum overall assembled length of the rifle shall be not greater than 48 inches.

3.5.2.2 Stock adjustment. The stock of the rifle shall be adjustable for length-of-pull not less than 13.5 inches and not greater than 16 inches (T), comb height (O), and cast-off/cast-on adjustment (O) (see 6.11)

3.5.2.3 Materials and finishes. The rifle shall incorporate self-lubricating coatings and materials that do not require grease or lubricants for the operating components (O).

3.5.2.4 Firing pin protrusion. The firing pin protrusion shall be no less than 0.038 inches and not greater than 0.045 inches.

3.5.2.5 Trigger pull. The trigger pull of the rifle shall have the following characteristics:

a. If not adjustable, the trigger pull shall be not less than four (4) pounds and not greater than five (5) pounds.

b. If adjustable, the trigger pull shall be adjusted without the use of special tools.

c. If adjustable, the trigger shall be able to be set at not less than four (4) and not greater than five (5) pounds.

d. After being set, the trigger mechanism shall retain the trigger pull setting within ±8 ounces but in no case shall it go below four (4) pounds or above five pounds, eight ounces (5 ½ lbs).

e. The trigger shall return to its normal forward position upon release after partial or complete trigger pull.

3.5.2.6 Noise. The rifle, when firing either suppressed or unsuppressed, using the M118LR or M993 Armor Piercing ammunition, shall have impulse noise levels that are not greater than the 140dB limit for single hearing protection sited in MIL-STD-1474, at the shooter or spotter location.

3.5.2.7 Ammunition compatibility/functioning. The rifle shall be capable of safely firing all current U. S. standard 7.62x51mm ammunition and the weapon shall be optimized to fire the M118LR cartridge.

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3.5.2.8 Magazine. Four detachable magazines with a capacity of ten (10) cartridges and four detachable magazines with a capacity of twenty (20) cartridges shall be provided with the SASS. The magazines shall be capable of being removed from the SASS using only one hand.

The magazine shall fall free of the rifle when the magazine release is actuated.

3.5.2.9 Mounting interface. The rifle shall have one or more integrated and/or detachable MIL-STD-1913, Picatinny Rails with numbered rail slots, parallel to the bore on top of the receiver, and used to mount the day optical sight. The rifle shall have sufficient rail surface, parallel to the bore, but not on the top of the receiver, to allow simultaneous mounting of other accessories (MILES, AN/PEQ-2, “clip-on” night vision capabilities, BUIS, etc.), which may be used in conjunction with day/night optics/electro-optics.

3.5.2.10 Bipod. The rifle shall have a detachable bipod. The bipod shall have legs that are independently adjustable in length, and shall provide rigid support when firing from the prone position. The legs shall fold, allowing the weapon to be stored in the system case without removing the bipod. The bipod shall attach to the rifle without the use of any tools.

3.5.2.11 Iron sights. The rifle shall be equipped with a detachable Back-Up Iron Sight (BUIS) for emergency use. The BUIS when attached and not in-use shall not interfere with the mounting and/or employment of the rifle’s primary optics/electro-optics.

3.5.2.11.1 Range. The BUIS shall be capable of range adjustments to 2,624.664 feet (800 meters) (T), 3,280.83 feet (1,000 meters)(O).

3.5.2.11.2 Detachability. The BUIS shall allow for replacement by trained personnel with tools common to the armorer’s tool kit (T). The BUIS shall allow for rapid attachment and detachment by the operator by hand or with the tools common to the snipers’ deployment kit (O).

When reattached, the BUIS shall have a change in zero of no more than 0.5 MOA, and have same adjustments as the day optic to reduce problems in low visibility.

3.5.2.11.3 Adjustability. The iron sights shall be adjustable for both elevation and azimuth in increments no greater than 0.5 MOA increments. The adjustments shall be, tactile clicks and capable of adjustment at all temperatures in the operating range (-50°F through 145°F), by a person dressed in cold weather environmental clothing (less the outer arctic mitten), and by a person dressed in NBC (MOPP IV) hand gear.

3.5.2.12 Sling swivels. The rifle shall have at least two attachment points to accept sling swivels. One sling swivel attachment point shall be located on the buttstock. There shall be at least one other attachment point located on the forward rail system, that is capable of accepting detachable sling swivels.

3.5.3 Day optical sight requirements.

3.5.3.1 Mounting interface. The day optical sight shall be equipped with a mounting system (e.g. rings and/or base interface) compatible with the MIL-STD-1913 Rail. The day

Provided by IHS Licensee=Armanent Research & Dev/6610100103 Not for Resale, 11/04/2008 08:23:44 MSTNo reproduction or networking permitted without license from IHS optical sight mounting system shall be easily attached/detached to the rifle by the operator, by hand and or with the tools common to the snipers’ deployment kit.

3.5.3.2 Reattachment. The day optical sight shall be capable of being removed from the rifle and reattached with a maximum change in the zero of the weapon of 0.5 MOA.

3.5.3.3 Optical glass. All optical glass shall be of high commercial quality in accordance with MIL-PRF-13830.

3.5.3.4 Anti-reflection coating. All lens surfaces shall be anti-reflection coated, allowing at least 85% light transmission for the assembled sight unit.

3.5.3.5 Eye relief. At the highest magnification, the eye relief shall be 3.3 inches (84

mm) or greater.

3.6 Environmental requirements.

3.6.1 System requirements.

3.6.1.1 Corrosion resistance. The SASS shall be protected with a durable corrosion resistant coating, or made from durable corrosion resistant materials, which are abrasion, impact and battlefield chemical resistant equal to or greater than phosphated steel or anodized aluminum. The materials and coatings used shall protect the SASS from corrosion in all environments and weather conditions, including marine, high humidity, rain and desert conditions.

3.6.1.1.1 Salt fog. The exposed rifle, complete with day optical sight (with lenses covered) and two fully loaded magazines shall be capable of firing two magazines without stoppages after standard salt fog test exposure of 48 hours (T) 96 hours (O). The system carrying case shall show no functional damage, and all metallic repair parts and tools contained in the deployment/cleaning kits shall show no evidence of red rust after standard salt fog test exposure of 48 hours (T) 96 hours (O).

3.6.1.1.2 Sand/dust. The rifle, with day optical sight attached and with lenses covered, shall be capable of firing one 20 round magazine without stoppages after exposure to sand and dust environment (O).

3.6.1.1.3 Rain. The rifle with day optical sight attached and with lenses covered, shall be capable of firing one 20 round magazine without stoppages after exposure to rain (O).

3.6.1.1.4 Icing. The rifle with day optical sight attached and with lenses covered, shall be capable of firing one 20 round magazine with no greater than one stoppage after being covered with ice (O).

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3.6.1.1.5 Mud. The rifle with day optical sight attached and with lenses covered, shall be capable of firing one 20 round magazine without stoppages functioning after being covered with mud (both wet and dried) (O).

3.6.1.1.6 Operating temperature. The rifle with day optical sight attached and with lenses covered, shall be capable of firing 100 rounds per hour, with no more than three stoppages, at temperatures ranging from not less than -50°F through not greater than 145°F.

3.6.1.2 Chemical resistance. Components of the SASS shall not be adversely affected by exposure to petroleum, oil and lubricant products, insect repellents and other common battlefield compounds, listed in TOP 3-2-609.

3.6.1.3 NBC decontamination. The SASS shall be NBC decontamination survivable, as specified in AR 70-75, to the level of DECON survivability associated with current small arms systems.

3.6.1.4 Fungus resistance. There shall be no detrimental effects, as specified in MIL- STD-810E, Method 508.4 “FUNGUS”, on components of the SASS due to fungal growth.

3.6.1.5 Electronic effects. The rifle with day optical sight attached shall be fully functional during and after the following E3 subtests:

a. External Electromagnetic Environment (EME)/Inter-system Electromagnetic Compatibility (IEMC) as specified in MIL-STD-461 and TOP 1-2-511.

b. Personnel Electrostatic Discharge (PESD) as specified in MIL-STD-464 and TOP 1- 2-511.

c. High-Altitude Electromagnetic Pulse (HEMP) as specified in MIL-STD-464.

d. Near Strike Lightning (NSL) tests as specified in MIL-STD-464.

3.6.1.6 Airborne capability. The rifle with day optical sight mounted shall be compatible with the M1950 series and AIRPAC weapons containers, as specified in FM 3- 21.220, and shall be Hi-Altitude jump compatible.

3.6.2 Rifle requirements.

3.6.2.1 Drop test. The rifle, with the safety in the safe position and an empty, primed 7.62mm cartridge in the chamber, shall withstand a five (5) foot drop onto concrete. The primed cartridge shall not discharge and there shall be no functional damage to the rifle.

3.6.3 Day optical sight requirements.

3.6.3.1 Drop test. The day optical sight shall show no functional damage when subjected to a two (2) foot drop onto concrete. The day optical sight, enclosed in its’ carrying case, shall show no functional damage when subjected to a seven (7) foot drop onto concrete.

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3.6.3.2 Watertightness. The day optical sight shall show no evidence of leakage when submerged in water to a minimum depth of 3.28 feet (one meter) for a one hour period. No moisture or fogging shall be observed.

3.6.3.3 High pressure. The day optical sight shall show no evidence of leakage when subjected to a minimum pressure of 4.3 pounds per square inch gage.

3.6.3.4 Sealing. The sight shall remain sealed when subjected to a maximum pressure of negative (-) 5.4 pounds per square inch gage.

3.6.3.5 Lens cover. The day optical sight shall have covers that protect the lenses from sunlight, debris and dust. These covers shall be securely fastened to the day optical sight, shall be capable of being opened while remaining attached to the sight and shall remain open during use.

3.6.4 System case requirements.

3.6.4.1 Drop test. The system carrying case fully loaded shall withstand a 30-inch drop (T), seven foot (O) onto concrete throughout all temperatures in the operating range (-50°F through 145°F). The system carrying case shall not open. There shall be no structural damage to the system carrying case that may result in damage to the contents during subsequent shipping, handling or storage. There shall be no functional or physical damage to its contents.

3.6.4.2 Transportation vibration. The system carrying case shall protect its full contents from transportation vibration. There shall be no functional or physical damage to the system carrying case or its contents.

3.6.4.3 Rain/moisture. The system carrying case shall keep its full contents dry when subjected to rain falling at a rate of at least 0.03 inches/minute with a crosswind of 60 feet/second.

3.6.4.4 Pressure test. The system carrying case shall be capable of maintaining an internal positive pressure of 0.5 psig (13.6 inches of water) for 6 minutes with no more than a 15% drop from the initial reading.

3.7 Support and ownership.

3.7.1 System requirements.

3.7.1.1 Reliability. The rifle with the day optic sight mounted shall be capable of a 90% probability of firing 300 rounds (3 basic loads) without incurring a critical failure (non-operator correctable Essential Function Failures (EFFs)) and a 90% probability of firing 100 rounds (1 basic load) without incurring an EFF (operator correctable and non-operator correctable) (see 6.11).

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3.7.1.1.1 Mean Rounds Between Essential Function Failure (MRBEFF). The rifle mounted with the day optical sight shall demonstrate a MRBEFF of 2,847 or greater at the lower 80% confidence level (see 6.11).

3.7.1.1.2 Mean Rounds Between Stoppages (MRBS). The rifle mounted with the day optical sight shall demonstrate a MRBS of 949 or greater at the lower 80% confidence level (see 6.11).

3.7.1.2 Service life. The SASS shall have a minimum service life of 10,000 rounds prior to depot overhaul. This excludes barrel replacement.

3.7.1.3 Maintainability. The SASS shall allow the operator to perform all necessary maintenance using standard DoD lubricant/solvent, without the use of any tools other than the equipment in the cleaning and deployment kits. Parts and assemblies removed or disassembled for maintenance under field conditions shall be designed to prevent improper assembly. Captive hardware shall be used to prevent loss of retaining pins.

3.7.1.4 Workmanship. The parts shall be clean and free of burrs, sharp edges, unblended radii, surface defects, cracks, chips, dirt, grease, oil (except where specifically required), rust, foreign matter that could render the system unsuitable for its intended purpose.

The fabrication shall be processed in such a manner as to be uniform in quality and shall be free from defects that affect serviceability and appearance.

3.7.2 Rifle requirements.

3.7.2.1 Barrel life. The rifle shall have a minimum barrel life of 5,000 rounds (T), 10,000 rounds (O) with re-barrel turn-in pending technical inspection/confirmation of unserviceable barrel. A barrel shall be considered unserviceable when the dispersion no longer meets requirement 3.4.1.1.2.

3.7.2.2 Parts interchangeability. All operator/intermediate support replaceable parts shall be interchangeable without hand or machine fitting.

3.7.2.3 Special clothing. The rifle with day optical sight mounted shall be operable by a person dressed in Nuclear, Biological, and Chemical (NBC) (MOPP IV) clothing and by a person dressed in cold weather clothing (except for the outer arctic mitten).

3.7.2.4 Marking. Each rifle shall have unique identification (UID) markings in accordance with MIL-STD-130. Individual serial numbers, along with the designation "U.S."

shall be permanently applied to the lower receiver in accordance with commercial practice. Rifle barrels shall be marked to show caliber, completion of proof testing and magnetic particle inspection.

3.7.3 Day optical sight requirements.

3.7.3.1 Cleanliness and optical quality. There shall be no evidence of glass fracture, cement separation, grease or fingerprints on any optical component when viewing through the

Provided by IHS Licensee=Armanent Research & Dev/6610100103 Not for Resale, 11/04/2008 08:23:44 MSTNo reproduction or networking permitted without license from IHS objective or eyepiece end of the sight unit. There shall not be more than 3 particles of foreign matter visible on the reticle surface and no particle shall exceed the apparent width of a reticle line. There shall be no foreign matter obvious to the unaided eye that would impair optical performance when looking into the eyepiece against a background having a brightness of the sky in average daylight.

3.7.3.2 Sight carrying case. The day optical sight shall be provided with a carrying case that accommodates the day optical sight with the LASER filter installed as well as the filter assembly when removed from the day optical sight. Typically, the LASER filter is 0.15-0.20 inches larger in diameter than the objective opening of the sight and about 2.5 inches in overall length.

3.7.4 System case requirements.

3.7.4.1 System carrying case. The system carrying case shall have provisions to securely contain and protect the following: rifle with and without the day optical sight mounted;

the un-mounted day optical sight enclosed in its carrying case; rifle with and without the bipod;

cleaning/deployment kits; all additional ancillary equipment specified below including the drag bag. The system carrying case shall have a pressure relief valve.

3.7.5 Ancillary equipment.

3.7.5.1 Deployment kit. The deployment kit shall consist of all operator replacement parts, operators’ manual, and any tools required for operator and organizational (unit) level maintenance. Parts shall have quality equivalent to those in the small arms repair man tool kit

(NSN 5180-01-462-4254).

3.7.5.2 Drag bag. The SASS shall be compatible with Drag Bag (NSN 1005-01-511- 7741) currently employed with the M24 SWS.

3.7.5.3 Magazine carriers. Each SASS shall have magazine carriers which shall allow for the carry of fully-loaded magazines, equal to the combat load of 100 rounds, and provide for secure attachment compatibility with Army standard load bearing equipment (LBE), tactical vests, assault packs, field packs and drag bag.

3.7.5.4 Cleaning equipment. The SASS shall be provided with a cleaning kit contained in carrying case. The cleaning kit shall contain all equipment/material necessary to perform operator level maintenance activities for both the SASS and day optical sight. Parts shall have quality equivalent to those in the small arms repairman tool kit (NSN 5180-01-462-4254).

3.7.5.5 Sling. The rifle shall have a detachable and adjustable, carry sling. The sling shall allow for quick transition from strong to weak hand firing without removal from the SASS, and allow for adjustment with one hand to facilitate weapon security during movement. The sling shall be detachable without the use of tools.

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4 VERIFICATION

TABLE I. Requirement/verification cross-reference matrix

Inspection sample size and criteria

Section 3 Requirements Design

Verification First Article Conformance

Inspection (One lot)

Verification Methods

Section 4 Verification Procedures

Design verification 3.1 X 4.2 First article inspection 3.2 X 4.3 Conformance inspection 3.3 X 4.4 Accuracy/ dispersion 3.4.1.1 3-0-11 5-0-1 100%2 Test 4.5.1.1 Accuracy 3.4.1.1.1 3-0-1 5-0-1 100%2 Test 4.5.1.1.1 Dispersion 3.4.1.1.2 3-0-1 5-0-1 100%2 Test 4.5.1.1.2

High pressure resistance 3.4.2.1 5-0-1 5-0-1 100%2 Test & Examination 4.5.2.1

Rifle action 3.4.2.2 5-0-1 Test 4.5.2.2

Safety 3.4.2.3 5-0-1 5-0-1 100%2 Demonstration & Examination 4.5.2.3

Suppressor 3.4.2.4 5-0-1 5-0-1 Demonstration 4.5.2.4 Recoil 3.4.2.5 1-0-1 Test 4.5.2.5 Elevation and windage adjustment 3.4.3.1 5-0-1 5-0-1 VL III 3 Demonstration 4.5.3.1

Elevation and windage range 3.4.3.2 5-0-1 5-0-1 VL III 3 Demonstration 4.5.3.2

Reticle 3.4.3.3 10-0-1 5-0-1 Examination 4.5.3.3 Parallax and focus adjustment 3.4.3.4 5-0-1 5-0-1 Examination 4.5.3.4

Parallax 3.4.3.5 5-0-1 5-0-1 Demonstration & Examination 4.5.3.5

Eyepiece focus 3.4.3.6 5-0-1 5-0-1 VL III 3 Examination 4.5.3.6 Objective opening 3.4.3.7 10-0-1 5-0-1 Examination 4.5.3.7 Magnification 3.4.3.8 10-0-1 5-0-1 VL III 3 Examination 4.5.3.8 Power zero retention 3.4.3.8.1 5-0-1 5-0-1 Examination 4.5.3.8.1 Resolution 3.4.3.9 5-0-1 5-0-1 VL III 3 Examination 4.5.3.9 Ballistic compensation 3.4.3.10 5-0-1 4.5.3.10 Field of view 3.4.3.11 5-0-1 5-0-1 VL III 3 Examination 4.5.3.11 Exit pupil diameter 3.4.3.12 5-0-1 5-0-1 VL III 3 Examination 4.5.3.12 Weight 3.5.1.1 100% Examination 4.6.1.1

1 Test three (3)- Accept with zero (0) failures- Reject with one (1) failure 2 Failure to meet the requirement will be cause for rejection of the rifle, day optical sight, or carrying case 3 Failure to meet the requirement will be cause for rejection of the lot of rifles, day optical sights, or carrying cases

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TABLE I. Requirement/verification cross-reference matrix - Continued

Requirements Design

Verification First Article Conformance

Inspection (One lot)

Verification Methods

Section 4 Verification Procedures

Special tools 3.5.1.2 5-0-1 5-0-1 Examination 4.6.1.2 Exterior surfaces 3.5.1.3 100% 5-0-1 100%2 Examination 4.6.1.3 Length 3.5.2.1 100% Examination 4.6.2.1 Stock adjustment 3.5.2.2 100% Examination 4.6.2.2 Materials and finishes 3.5.2.3 See 4.6.2.2 See 4.6.2.2 See 4.6.2.23 Examination 4.6.2.3 Firing pin protrusion 3.5.2.4 5-0-1 5-0-1 100%2 Examination 4.6.2.4 Trigger pull 3.5.2.5 5-0-1 5-0-1 100%2 Test 4.6.2.5 Noise 3.5.2.6 1-0-1 Test 4.6.2.6 Ammunition compatibility/functioning 3.5.2.7 1-0-1 Test 4.6.2.7

Magazine 3.5.2.8 5-0-1 Demonstration 4.6.2.8

Mounting interface (rifle) 3.5.2.9 5-0-1 Examination & Demonstration 4.6.2.9

Bipod 3.5.2.10 5-0-1 Demonstration 4.6.2.10 Iron sights 3.5.2.11 3-0-1 5-0-1 VL III 3 Demonstration 4.6.2.11 Range 3.5.2.11.1 3-0-1 5-0-1 VL III 3 Test 4.6.2.11.1

Detachability 3.5.2.11.2 3-0-1 5-0-1 VL III 3 Demonstration & Test 4.6.2.11.2

Adjustability 3.5.2.11.3 3-0-1 5-0-1 VL III 3 Demonstration 4.6.2.11.3 Sling swivels 3.5.2.12 10-0-1 Examination 4.6.2.12 Mounting interface (sight) 3.5.3.1 5-0-1 Demonstration 4.6.3.1 Reattachment 3.5.3.2 10-0-1 Demonstration 4.6.3.2 Optical glass 3.5.3.3 See 4.6.3.3 See 4.6.3.3 See 4.6.3.33 Examination 4.6.3.3 Anti-reflection coating 3.5.3.4 See 4.6.3.4 See 4.6.3.4 See 4.6.3.43 Examination 4.6.3.4 Eye relief 3.5.3.5 5-0-1 5-0-1 VL III 3 Examination 4.6.3.5 Corrosion resistance 3.6.1.1 See 4.7.1.1 See 4.7.1.1 See 4.7.1.13 Examination 4.7.1.1 Salt fog 3.6.1.1.1 14 Test 4.7.1.1.1 Sand/dust 3.6.1.1.2 34 Test 4.7.1.1.2 Rain 3.6.1.1.3 34 Test 4.7.1.1.3 Icing 3.6.1.1.4 34 Test 4.7.1.1.4 Mud 3.6.1.1.5 34 Test 4.7.1.1.5 Operating temperature 3.6.1.1.6 34 Test 4.7.1.1.6 Chemical resistance 3.6.1.2 1-0-1 Test 4.7.1.2 NBC decontamination 3.6.1.3 1-0-1 Analysis 4.7.1.3 Fungus resistance 3.6.1.4 1-0-1 Test 4.7.1.4

4 Number of units to be tested, accept/reject criteria can be found in verification procedure specified

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TABLE I. Requirement/verification cross-reference matrix – Continued

Requirements Design

Verification First Article Conformance

Inspection (One lot)

Verification Methods

Section 4 Verification Procedures

Electronic affects 3.6.1.5 1-0-1 Test 4.7.1.5 Airborne capability 3.6.1.6 10-0-1 Test 4.7.1.6 Drop test (rifle) 3.6.2.1 1-0-1 Test 4.7.2.1 Drop test (sight) 3.6.3.1 1-0-1 Test 4.7.3.1 Watertightness 3.6.3.2 3-0-1 5-0-1 Test 4.7.3.2 High pressure 3.6.3.3 5-0-1 5-0-1 VL III3 Test 4.7.3.3 Sealing 3.6.3.4 5-0-1 5-0-1 VL III 3 Test 4.7.3.4 Lens cover 3.6.3.5 5-0-1 5-0-1 VL III 5 Examination 4.7.3.5 Drop test (case) 3.6.4.1 1-0-1 Test 4.7.4.1 Transportation vibration 3.6.4.2 1-0-1 Test 4.7.4.2 Rain/moisture 3.6.4.3 1-0-1 1-0-1 Test 4.7.4.3 Pressure test 3.6.4.4 5-0-1 5-0-1 100%2 Test 4.7.4.4 Reliability 3.7.1.1 See 4.8.1.1 See 4.8.1.1.9 See 4.8.1.1.106 Test 4.8.1.1 MRBEFF 3.7.1.1.1 See 4.8.1.1 See 4.8.1.1.9 See 4.8.1.1.106 Test 4.8.1.1 MRBS 3.7.1.1.2 See 4.8.1.1 See 4.8.1.1.9 See 4.8.1.1.106 Test 4.8.1.1 Service life 3.7.1.2 5-0-1 Test 4.8.1.2 Maintainability 3.7.1.3 1-0-1 Examination 4.8.1.3 Workmanship 3.7.1.4 5-0-1 5-0-1 VL III 3 Examination 4.8.1.4 Barrel life 3.7.2.1 5-0-1 Test 4.8.2.1 Parts interchangeability 3.7.2.2 6-0-1 5-0-1 VL I6 Demonstration 4.8.2.2 Special clothing 3.7.2.3 1-0-1 Demonstration 4.8.2.3 Marking 3.7.2.4 100% 5-0-1 100%2 Examination 4.8.2.4 Cleanliness and optical quality 3.7.3.1 5-0-1 5-0-1 VL II3 Examination 4.8.3.1

Sight carrying case 3.7.3.2 3-0-1 Demonstration 4.8.3.2 System carrying cases 3.7.4.1 3-0-1 Demonstration 4.8.4.1

Deployment kit 3.7.5.1 3-0-1 Examination/ Analysis 4.8.5.1

Drag bag 3.7.5.2 100% Demonstration 4.8.5.2 Magazine carriers 3.7.5.3 100% Demonstration 4.8.5.3

Cleaning equipment 3.7.5.4 100% Examination/ Analysis 4.8.5.4

Sling 3.7.5.5 5-0-1 Demonstration 4.8.5.5

5 Failure to meet the applicable requirement shall be cause for rejection of the lot of lens covers.

6 This test shall be performed on the first lot and every third lot thereafter. Failure to meet the requirement shall be cause for rejection of the lot. The test shall then be performed on all previous lots since the last successful test.

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4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:

a. Design verification (see 4.2).

b. First article inspection (see 4.3).

c. Conformance inspection (see 4.4).

4.2 Design verification. When specified (see 6.2), a sample of SASS shall be subjected to design verification in accordance with Table I.

4.2.1 Design verification test rejection. If any sample fails to comply with the design verification requirements, the design shall be rejected.

4.3 First article inspection. When specified (see 6.2), a sample of SASS shall be subjected to first article inspection in accordance with Table I.

4.3.1 First article rejection. If any SASS fails to comply with any of the applicable requirements, the first article sample shall be rejected.

4.4 Conformance inspection. When specified (see 6.2), a sample of SASS shall be subjected to conformance inspection in accordance with Table I. Verification Levels (VL) shall be in accordance with MIL-STD-1916.

4.4.1 Inspection lot formation. Unless otherwise specified, lot formation shall be in accordance with MIL-STD-1916.

4.4.2 Lot size. The maximum lot size shall be one (1) months production.

4.4.3 Lot identification. Each inspection lot shall be identified with a lot number.

4.4.4 Conformance inspection rejection. Failure to meet any of the requirements shall be cause for rejection of the lot. (See 6.3)

4.5 Operating requirements.

4.5.1 System requirements.

4.5.1.1 Accuracy/dispersion. Before firing for record, ten (10) shots shall be fired to foul the bore, settle the rifle action and zero the day optic sight. The trigger pull (if adjustable) shall be set to between four and five pounds. Four, five round shot groups shall then be fired using the same point of aim for all rounds. Two of the four targets shall be fired without the suppressor and the other two shall be fired with the suppressor attached. The radial distance from the calculated mean point of impact of the first target compared to the calculated mean point of impacts of subsequent targets shall be less than or equal to 1.0 minutes of angle (MOA).

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4.5.1.1.1 Accuracy. The four targets shall be identified with a common reference coordinate system to quantify movement in the calculated mean point of impact from target to target. The suppressor shall be removed and reattached between firing the two suppressed shot groups.

4.5.1.1.2 Dispersion. Testing shall be performed using the rifle with day optical sight from a bench rested, shoulder fired position or a test firing fixture (hard stand). Testing shall be conducted at 300 feet using M118LR Ammunition or equivalent.

4.5.2 Rifle requirements.

4.5.2.1 High pressure resistance. Each rifle shall fire one (1) M60 High Pressure Test cartridge. After proof firing, each rifle shall be visually examined for cracks, deformations, and other evidence of damage. Cartridge cases shall be visually examined for bulges, splits, rings and other defects caused by defective barrels. The barrel, bolt and receiver shall be examined by magnetic particle inspection, in accordance with ATSM E 444, for cracks, and other evidence of damage.

4.5.2.2 Rifle action. The rifle shall fire ten rounds to demonstrate rifle action.

4.5.2.3 Safety. Safety operation shall be determined by visual examination of the firing mechanism. With the safety in the safe position and the rifle unloaded and cocked, three attempts shall be made to fire the rifle. This examination shall be sufficient to ensure the safety shall prevent accidental discharge if a live cartridge were in the chamber. With the safety in the safe position, the force to move it to the fire position shall be measured. The required force to move it back to the safe position shall then be measured. Any evidence of the weapon firing while in the safe mode during any testing shall be cause for failure.

4.5.2.3.1 Design verification only. The above procedure shall be repeated under the following conditions:

a. By a person dressed in NBC (MOPP IV) hand gear, after which the safety shall be moved to the fire position.

b. After the rifle has been conditioned for a minimum of four hours in a hot temperature chamber at 145°F ± 5°F.

c. After the rifle has been conditioned for a minimum of four hours in a cold temperature chamber at -50°F ± 5°F, by a person dressed in cold weather environmental clothing with the outer arctic mitten removed.

4.5.2.4 Suppressor. It shall be demonstrated that the suppressor can be attached and detached from the rifle by hand or with tools common to the sniper’s deployment kit. The suppressed weapon shall then be tested in accordance with accuracy/dispersion testing.

4.5.2.5 Recoil. The rifle shall be tested in accordance with TOP 3-2-504

4.5.3 Day optical sight requirements.

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4.5.3.1 Elevation and windage adjustment. The day optical sight shall be rigidly mounted to a test fixture and the reticle movement measured using an optical collimator. The elevation and windage knobs shall be cycled from zero (0) to the extreme adjustments and returned, for 10 cycles. The zero position of the day optical sight, as defined by the intersection of the vertical and horizontal reticle lines, shall not have moved more than specified in the requirement.

4.5.3.2 Elevation and windage range. During the accuracy/dispersion test the SASS shall be zeroed on the 300 feet target with the day optical sight. To determine conformance to the requirement, the number of tactile clicks of reticle adjustment between the zeroed position of the windage and elevation shall be counted.

4.5.3.3 Reticle. The day optical sight shall be visually/manually examined.

4.5.3.4 Parallax and focus. The day optical sight shall be visually examined.

4.5.3.5 Parallax. Sighting through the day optical sight and observing a point on the target at the 2,624.66 ± 32.8 feet (800 meters ± 10 meters), with respect to a corresponding point of the day optical sight reticle in close proximity to the optical axis shall check parallax. Parallax shall be recognized as any apparent displacement of the target image in relation to the reticle image when the observer's head is moved.

4.5.3.6 Eyepiece focus. The range of adjustment for the eyepiece adjustment shall be determined using standard optical measuring equipment to determine conformance to the

4.5.3.7 Objective opening. The objective opening shall be visually/manually examined.

4.5.3.8 Magnification. The magnification of the day optical sight shall be measured using standard optical measuring equipment.

4.5.3.8.1 Power zero retention. The magnification of the day optical sight shall be adjusted. At each power setting the zero of the sight shall be checked.

4.5.3.9 Resolution. The resolution of the day optical sight shall be measured using standard optical measuring equipment.

4.5.3.10 Ballistic compensation. The sight shall be zeroed at 328.08 feet (100 meters).

Ten (10) rounds shall be fired at targets at 1312.33, 1968.5, and 2624.66 feet (400, 600, and 800 meters, respectively).

4.5.3.11 Field of view. The FOV of the day optical sight shall be measured using standard optical measuring equipment.

4.5.3.12 Exit pupil diameter. The exit pupil diameter of the day optical sight shall be measured using standard optical measuring equipment.

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4.6 Interface and interoperability requirements.

4.6.1 System requirements.

4.6.1.1 Weight. The rifle, complete with suppressor, bipod, MIL-STD-1913 rail, day optical sight, sling, and a 10 round magazine (unloaded) shall be weighed using SMTE.

4.6.1.2 Special tools. The SASS shall be disassembled without the use of special tools.

4.6.1.3 Exterior surfaces. Exterior surfaces of he SASS shall be visually examined.

4.6.2 Rifle requirements.

4.6.2.1 Length. The rifle shall be measured using SMTE to determine conformance to the requirement.

4.6.2.2 Stock adjustment. The buttstock shall be extended, and the length of pull shall be measured.

4.6.2.3 Materials and finishes. Objective evidence shall be examined.

4.6.2.4 Firing pin protrusion. The bolt shall be closed and the trigger pulled, and the firing pin protrusion shall be measured using SMTE.

4.6.2.5 Trigger pull. Prior to performing the targeting and accuracy test, the trigger pull shall be set to its minimum setting (if adjustable). The rifle shall be charged to cock the firing mechanism, and the safety placed in the fire position. A measured force shall be gradually applied to the center of the trigger, parallel to the axis of the barrel bore until the firing mechanism is released. This shall be repeated five times. To determine conformance to the requirement, all of the readings shall be not less than four (4) and not greater than five (5) pounds. The accuracy/dispersion test shall then be performed.

4.6.2.5.1 First article only. Prior to the start of the reliability test, the trigger pull shall be set between four (4) and five (5) pounds (if adjustable). Ten trigger pull readings shall be taken as described above to establish an average trigger pull setting. Five trigger pull reading shall be taken every 500 rounds during the reliability test. No trigger pull adjustments shall be performed during the endurance test. All readings shall be within ± 8 ounces of the average setting. At the completion of the reliability test the trigger pull shall be reset to its minimum force setting (if adjustable). The rifle shall be charged to cock the firing mechanism, and the safety placed in the fire position. Force shall be gradually applied to the center of the trigger, parallel to the axis of the barrel bore until the firing mechanism is released. This shall be repeated five times. To be acceptable all of the readings shall be not less than four (4) pounds and not greater than five and one half (5 ½ ) pounds.

4.6.2.6 Noise. A noise test shall be conducted outdoors using one rifle. Five rounds of M118LR Ammunition shall be fired. The peak sound pressure levels shall be measured at the

Provided by IHS Licensee=Armanent Research & Dev/6610100103 Not for Resale, 11/04/2008 08:23:44 MSTNo reproduction or networking permitted without license from IHS locations given below, at a height of 4.921 feet (1.5 meters) to determine conformance to the requirement. The test shall then be repeated using a suppressed rifle and the peak sound pressure levels shall be measured at the locations given below, at a height of 4.921 feet (1.5 meters).

Shooter’s left ear.

16.4 feet (5…