(1)_M40_Product_Description.pdf

PURCHASE DESCRIPTION

FOR THE

M40 SNIPER RIFLE MODULAR STOCK

1. SCOPE

1.1 Scope. This Purchase Description establishes the attributes, interface, and physical requirements for the M40 Sniper Rifle Modular Stock. The Modular Stock will be one of multiple components which will be assembled to make the M40 Sniper Rifle. The M40 Sniper

Rifle is a bolt-action rifle which fires 7.62x51mm NATO ammunition.

1.2 Requirement Levels. Use of the term “shall” in this Purchase Description indicates a required attribute. Use of the term “should” or “preferred” indicates an attribute that is desired, but not required.

2. APPLICABLE DOCUMENTS

2.1 General. The following documents are referenced in this purchase description and are necessary to ensure procured items meet the requirements specified herein. While every effort has been made to ensure the completeness of this list, readers are cautioned that they shall meet all specified requirements of documents cited in the purchase description, whether or not they are listed here.

2.2 Government Documents

2.2.1 Specifications, Standards, and Handbooks. The following specifications, standards, and handbooks of the exact revision listed below form a part of this document to the extent specified herein.

DEPARTMENT OF DEFENSE STANDARDS

MIL-STD-1913 - Dimensioning of Accessory Mounting Rail For

Small Arms Weapons

(Copies of these documents are available online at https://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

Government documents, drawings, and publications of the exact revision listed below form a part of this document to the extent specified herein.

https://assist.daps.dla.mil/quicksearch/

M40MS-PD-A

US ARMY DEVELOPMENTAL TEST COMMAND

TOP 3-2-045 - Automatic Weapons, Machineguns, Hand and

Shoulder Weapons (17 Sep 2007)

(Copies of this document are available 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.)

US MARINE CORPS SYSTEMS COMMAND DRAWINGS

08009A1103 - Barrel, M40A5 Rifle

99004A1102 - Lug, Recoil

99004A1122 - Receiver, Cartridge, Sniper Rifle

99004A1201 - Bolt Body Assembly

(Copies of these drawings may be requested from the procuring activity.)

2.3 Order of precedence. In the event of a conflict between the text of this purchase description and the references cited herein, this purchase description takes precedence. Nothing in this document, however, supersedes applicable laws and regulations.

3. REQUIREMENTS

3.1 MODULAR STOCK REQUIREMENTS. All requirements in this section shall be met when the Modular Stock is integrated with the M40 Sniper Rifle, unless otherwise noted.

3.1.1 Modular Stock System. Each Modular Stock shall include two sling swivels (see

3.1.5.1).

3.1.2 M40 Sniper Rifle Assembly.

3.1.2.1 Integration with Current M40 Components. The Modular Stock shall assemble with the current components of the M40 Sniper Rifle, as listed below:

a. Modified Remington 700 right-handed short-action receiver (see drawing

99004A1122)

b. Modified Schneider barrel (see drawing 08009A1103)

c. D.D. Ross recoil lug (see drawing 99004A1102)

d. Modified Remington bolt assembly (see drawing 99004A1201)

e. Remington trigger assembly (part #96024)

f. Remington bolt stop (part #17013)

g. Remington bolt stop spring (part #15224)

h. Harris bipod (part #S-BRM)

i. Surefire suppressor (part #FA762SS-BK) http://www.dtc.army.mil/publications/topsindex.aspx

j. Tactical Intervention Quick Cuff Model 2 Sling (part #QCM-2)

k. Sniper Weapon Tripod (see 3.1.5.2.1)

l. Optional (see 3.1.5.2) D.D. Ross optical sight platform (part #OP-700-SA-30)

m. Optional (see 3.1.5.3) Badger Ordnance 5-round .308 magazine (part #306-82-5)

n. Optional (see 3.1.2.2) 1.0” ring mounts (part # 306-75) or 1.5” ring mounts (part #

306-76).

The M40 Modular Stock should assemble with these components without requiring any modification to the stock or other components during the build process.

3.1.2.2 Bedding Compound. The Modular Stock shall be able to accept the M40 barreled action (barrel, receiver, and recoil lug) without requiring bedding compound.

3.1.2.3 Caliber Upgrade Ready. The Modular Stock should assemble and function with a

.338 Lapua Magnum barreled action to facilitate potential future M40 upgrades.

3.1.3 Physical Characteristics.

3.1.3.1 Weight. The Modular Stock shall weigh less than 6.3 lbs. Less than 5.0 lbs is preferred. If the stock’s 12-o’clock rail does not replace the M40 Optical Platform (see 3.1.5.2), then the stock shall weigh less than 5.8 lbs (less than 4.5 lbs is preferred).

3.1.3.2 Exterior Surfaces. All exposed exterior stock surfaces shall have a dull, low-reflective finish. The external stock colors shall be consistent with current Marine Corps camouflage colors. The stock color should be Sand (FED-STD-595, color 30277).

3.1.4 Performance Characteristics.

3.1.4.1 Folding Stock. The Modular Stock shall fold in order to decrease the overall length of the M40 Sniper Rifle.

3.1.4.2 Ejection of Rounds. When unfolded, the Modular Stock shall not interfere with the ejection of a spent or unfired round.

3.1.4.3 Bolt Manipulation. When unfolded, the Modular Stock shall not interfere with bolt manipulation.

3.1.5 Interface Requirements.

3.1.5.1 Sling Attachment. The Modular Stock shall include sling swivels that facilitate the attachment of the Quick Cuff Model 2 sling to the stock. The Modular Stock should interface with either of the sling swivels used with the M40 or the M110 SASS: Part number CC-35-SS

(NSN 1005-01-511-8448) or Part number 20312 (NSN 1005-01-572-8023) respectively. The

Modular Stock shall possess three sling swivel mounting points (3-, 6-, and 9-o'clock positions) at the fore end and one at the aft end. The Stock should possess three sling swivel mounting points (3-, 6-, and 9-o'clock positions) at the aft end and at the midpoint of the stock. The mounting point locations shall not cause the sling to interfere with operation of the M40 Rifle.

3.1.5.2 Accessory Rails. The Modular Stock shall possess MIL-STD-1913 compatible rails at the 3-, 6-, and 9-, and 12-o'clock positions (major axis horizontal, normal firing position with the 12 o’clock at the top of the weapon). The MIL-STD-1913 rail slots should be numbered, and the numbers should increase as they move away from the shooter. The rails at the 3-, 6-, and 9-o'clock positions shall be located forward of the magazine well and should be removable by the operator.

3.1.5.2.1 Tripod Compatibility. With the bipod attached to the Modular Stock, the 6-o'clock rail shall be able to accommodate mounting and use of the Sniper Weapon Tripod (an assembly composed of NSNs 1005-01-604-6216, 1005-01-604-6218, 1005-01-604-6158, and

1005-01-604-6222).

3.1.5.2.2 Top Rail. The 12-o’clock rail shall accommodate mounting and use of either version of the Marine Corps Scout Sniper Day Scope (SSDS) [NSNs 1240-01-533-1854 and

1240-01-586-9839] and the Scout Sniper Mid-Range Night Sight (SSMRNS) [NSN 5855-01-

547-9489] concurrently. If the vendor-provided 12-o’clock rail does not accommodate the SSDS and SSMRNS concurrently, the Modular Stock shall be compatible with the existing M40

Optical Rail (manufacturer: DD Ross; part # OP-700-SA-30). Compatibility with the M40

Optical Rail indicates that the M40 can be properly employed with the SSDS mounted to the

M40 Optical Rail and with the SSMRNS attached to the Modular Stock's 12-o'clock rail.

The SSDS shall mount on the Top Rail with 1.0” (part # 306-75) or 1.5” (part # 306-76) ring mounts. The 1” ring mounts are preferred.

If the 12-o’clock rail has a break or joint in it (i.e. it is not fabricated from a single piece of metal/material), the break in the rail shall not be located under or between the SSDS mounting rings or under the SSMRNS locking mount.

The 12-o’clock rail shall include a bias which enables the M40 to be zeroed at 100 meters and engage targets out to 914 meters with the SSDS crosshairs aligned on the target when firing U.S.

Government DODIC AA11 or AB39 ammunition, while allowing for appropriate elevation adjustments due to weather and altitude.

3.1.5.2.3 Attached Accessories. The Modular Stock rails shall accommodate mounting and use of the AN/PEQ-15 Advanced Target Pointer Illuminator Aiming Light (NSN 5855-01-

534-5931) or the AN/PEQ-16 Integrated Pointer/Illuminator Module (NSN 5855-01-538-5521) when the SSDS and SSMRNS are simultaneously mounted to the 12-o’clock rail(s).

3.1.5.3 Magazines. The Modular Stock shall meet all requirements in this Purchase

Description with contractor-provided 10-round magazines or with the current M40 5-round magazines (Manufacturer: Badger Ordnance; part #306-82-5). It is preferred that the Modular

Stock meet all requirements in this Purchase Description with the contractor-provided 10-round magazines and with the Badger Ordnance 5-round magazines so the Government can use either the contractor-provided 10-round magazines or the current M40 5-round magazines with the selected Modular Stock.

3.1.6 Maintainability.

3.1.6.1 Cleaning Materials. The stock shall not require the use of cleaners and lubricants other than standard U.S. Government weapons cleaners and lubricants.

3.1.7 Environmental Conditions.

3.1.7.1 Corrosion Resistance. The stock shall safely function after exposure to severe environments and weather conditions, including high humidity and salt fog. The stock should show no signs of corrosion after exposure to severe environments and weather conditions, including high humidity and salt fog.

3.1.7.2 Chemical Resistance. The stock shall safely function after exposure to petroleum, oil and lubricant products, insect repellents and other common battlefield compounds. The stock should not be adversely affected by exposure to petroleum, oil and lubricant products, insect repellents and other common battlefield compounds.

3.1.8 Human Factors.

3.1.8.1 Firing Hand Grip. The stock shall have an ergonomic grip of a size and contour that allows the operator’s firing hand to naturally curve around the grip without strain while providing positive control and resisting slipping.

3.1.8.2 Hand-hold Notch. The stock shall possess an ergonomic hand-hold notch for the non-firing hand to maintain rearward pressure to the shoulder. The location of the notch shall facilitate the shooter applying rearward pressure for periods greater than 10 minutes without causing muscle fatigue. The notch shall be ambidextrous and shall minimize hand fatigue during firing.

3.1.8.3 Recoil Transfer. The stock shall be designed to direct the recoil of the rifle into the operator’s shoulder so as to minimize barrel lift during firing. The stock shall include a recoil pad to reduce felt recoil by the operator. The recoil pad should feature vertical adjustment with a tool-less locking mechanism.

3.1.8.4 Cheek Piece. The stock shall possess a cheek piece that can be adjusted vertically and does not interfere with bolt manipulation in any position. Cheek piece manipulation shall not require the use of Special Tools (see 10). The cheek piece shall be sufficiently rigid to allow operators to maintain consistent cheek weld pressure from shot to shot. The cheek piece should be capable of being locked in place without the use of any tools. The cheek piece should be adjustable side-to-side and backward/forward. The cheek piece should adjust to various heights between 2.5 inches below optical centerline and 1.0 inch below optical centerline. The cheek piece should adjust horizontally 7/8 inch to the left and to the right of the centerline of the stock.

3.1.8.5 Length of Pull. The stock shall allow for length of pull adjustment by the operator without the use of Special Tools. The length of pull should at least cover the range of

13.5 to 16.5 inches, as measured from the front of the trigger to the back of the recoil pad. The length of pull should be adjustable in 1/4 inch (or smaller) increments.

3.1.8.6 Body Alignment. The stock shall facilitate the body alignment required for the operator to maintain proper eye position and acquire proper sight picture with minimal physical strain in all shooting positions.

3.1.8.7 Magazine Release. The magazine release shall be external of the trigger guard.

The operator shall be able to remove the magazine in all levels of dress.

3.2 M40 SNIPER RIFLE REQUIREMENTS. The M40 Sniper Rifle, when assembled with the Modular Stock, shall meet all requirements of this section.

3.2.1 Physical Characteristics.

3.2.1.1 System Length. The M40 Sniper Rifle, without suppressor, shall measure less than 40.5 inches in length with the stock folded. Less than 36.0 inches is preferred.

3.2.1.2 Stock Design. The design of the Modular Stock shall allow for an upward angle of the rifle barrel when operating the M40 Sniper Rifle on level ground with the bipod in its shortest position.

3.2.2 Performance Characteristics.

3.2.2.1 Dispersion. When firing U.S. Government DODIC AB39 ammunition, the M40

Sniper Rifle (with suppressor) shall fire five 10-round shot groups with an average mean radius no greater than 1.8 inches at 300 meters.

3.2.2.2 Firing Rate. The M40 Sniper Rifle, with suppressor, shall be capable of firing one round every three seconds while allowing the operator to maintain cheek weld, spot weld, and sight alignment.

3.2.3 Reliability.

3.2.3.1 System Reliability. The M40 Sniper Rifle shall have a minimum Mean Rounds

Between Essential Function Failure (MRBEFF) of 2,500 rounds at a Confidence Level (CL) of

75%. A minimum MRBEFF of 10,000 rounds at a CL of 75% is preferred. The M40 Sniper

Rifle shall have a minimum Mean Rounds Between Stoppage (MRBS) of 1,200 rounds at a CL of 75%. A minimum MRBS of 5,000 rounds at a CL of 75% is preferred.

3.2.4 Maintainability.

3.2.4.1 Field Cleaning. The operator shall be able to remove the magazine, suppressor and bolt from the M40 Sniper Rifle (as required for regular field cleaning) in one minute or less without tools. Thirty seconds or less is preferred. The operator shall be able to reassemble the

M40 Sniper Rifle from breakdown (as required for regular field cleaning) in one minute or less without tools. Thirty seconds or less is preferred.

3.2.5 Environmental Conditions.

3.2.5.1 Rough Handling. The M40 Sniper Rifle shall withstand the shock from a user conducting routine firing and combat movement. The SSDS mounted to the 12 o’clock rail shall not require re-zeroing after exposure to combat movements.

3.2.5.2 Sand/Dust. The M40 Sniper Rifle shall Safely Function and should Reliably

Function (see 6.1.5) after exposure to a severe sand/dust environment.

3.2.5.3 Water Submersion. The M40 Sniper Rifle shall Safely Function and should

Reliably Function after being submersed in water for ten minutes.

3.2.5.4 Mud. The M40 Sniper Rifle shall Safely Function and should Reliably Function after exposure to a mud environment.

3.2.5.5 Temperature Extremes. The M40 Sniper Rifle shall safely function and shall reliably function through a temperature range of -25º F to 120º F.

3.2.6 Safety.

3.2.6.1 Safety Mechanism. The operator shall be able to manipulate the safety mechanism using the shooting hand and without changing the firing grip.

3.2.6.2 Safe Design. The design of the Modular Stock when fitted with the M40 barreled action shall not present any significant safety risk to the operator or to the environment during the cycle of functioning, transportation, training, storage, maintenance, or disposal.

3.2.7 Human Factors.

3.2.7.1 Reload Time. The M40 Sniper Rifle shall be reloadable by a trained operator, in the prone position and with a ready magazine, in less than 5 seconds. Less than 3 seconds is preferred.

3.2.7.2 Clothing/Gear Compatibility. The M40 Sniper Rifle shall be capable of employment by an operator wearing Mission Oriented Protective Posture (MOPP) IV gear.

4. VERIFICATION

Table 1. Requirement/Verification Cross-Reference Matrix. Refer to Section 6 for a description of Phase-1, -2 and -3 Testing.

Requirement

Section 3

Requirement s

Section 4

Verification

Procedures

Phase 1

Testing

Phase 2

Testing

Phase 3

Testing

Modular Stock System 3.1.1 4.1.1 X

Integration with Current

M40 Components

3.1.2.1 4.1.2.1

X

Bedding Compound 3.1.2.2 4.1.2.2 X

Caliber Upgrade Ready 3.1.2.3 4.1.2.3 X

Weight 3.1.3.1 4.1.3.1 X

Exterior Surfaces 3.1.3.2 4.1.3.2 X

Folding Stock 3.1.4.1 4.1.4.1 X

Ejection of Rounds 3.1.4.2 4.1.4.2 X X

Bolt Manipulation 3.1.4.3 4.1.4.3 X X

Sling Attachment 3.1.5.1 4.1.5.1 X X

Accessory Rails 3.1.5.2 4.1.5.2 X

Tripod Compatibility 3.1.5.2.1 4.1.5.2.1 X

Top Rail 3.1.5.2.2 4.1.5.2.2 X X

Attached Accessories 3.1.5.2.3 4.1.5.2.3 X X

Magazines 3.1.5.3 4.1.5.3 X X X

Cleaning Materials 3.1.6.1 4.1.6.1 X

Corrosion Resistance 3.1.7.1 4.1.7.1 X

Chemical Resistance 3.1.7.2 4.1.7.2 X

Firing Hand Grip 3.1.8.1 4.1.8.1 X X

Hand-hold Notch 3.1.8.2 4.1.8.2 X X

Recoil Transfer 3.1.8.3 4.1.8.3 X X

Cheek Piece 3.1.8.4 4.1.8.4 X X

Length of Pull 3.1.8.5 4.1.8.5 X X

Body Alignment 3.1.8.6 4.1.8.6 X

Magazine Release 3.1.8.7 4.1.8.7 X

System Length 3.2.1.1 4.2.1.1 X

Stock Design 3.2.1.2 4.2.1.2 X

Dispersion 3.2.2.1 4.2.2.1 X X

Firing Rate 3.2.2.2 4.2.2.2 X

System Reliability 3.2.3.1 4.2.3 X X X

Field Cleaning 3.2.4.1 4.2.4.1 X X

Rough Handling 3.2.5.1 3.2.5.1 X

Sand/Dust 3.2.5.2 3.2.5.2 X

Water Submersion 3.2.5.3 3.2.5.3 X

Mud 3.2.5.4 3.2.5.4 X

Temperature Extremes 3.2.5.5 3.2.5.5 X

Safety Mechanism 3.2.6.1 4.2.6.1 X X

Safe Design 3.2.6.2 4.2.6.2 X X X

Reload Time 3.2.7.1 4.2.7.1 X

Clothing/Gear

Compatibility

3.2.7.2 4.2.7.2

X

4.1 MODULAR STOCK VERIFICATION. Failures of the M40 Sniper Rifle to achieve the performance levels required in this Purchase Description will not be charged against the M40

Modular Stock if the failure cannot be attributed to the stock or its interaction with the rifle system but is, instead, attributed to the Government-furnished components.

4.1.1 Modular Stock System. The Modular Stock will be inspected to verify that the required components are included.

4.1.2 M40 Sniper Rifle Assembly.

4.1.2.1 Integration with Current M40 Components. The Marine Corps will build a version of the M40 Sniper Rifle with the submitted Modular Stock and the components listed in

3.1.2.1. The build procedure will be conducted in accordance with the Marine Corps’ current

M40 build procedures in addition to information provided by the manufacturer of the Modular

Stock. Any difficulties experienced or modifications made to components during assembly will be recorded.

4.1.2.2 Bedding Compound. The Modular Stock mounting instructions provided by the manufacturer will be analyzed to ensure they do not require the use of bedding compound to assemble the M40 Sniper Rifle.

4.1.2.3 Caliber Upgrade Ready. The vendor information and procedures will be analyzed to ensure that potential .338 Lapua Magnum barreled actions can be integrated with the Modular

Stock.

4.1.3 Physical Characteristics.

4.1.3.1 Weight. The Modular Stock (with rails attached to accommodate the requirements in 3.1.5.2) will be weighed with the two sling swivels, any spacers provided for extending the length of pull, and all bolts, screws or other fastening devices required to attach the stock to the M40 barreled action.

4.1.3.2 Exterior Surfaces. The Modular Stock will be visually inspected to verify that all surfaces are dull in finish. The Modular Stock surfaces will be inspected for coloration consistent with current camouflage patterns and colors. The Modular Stock coloration will be visually compared against sand color sample 30277, FED STD 595B.

4.1.4 Performance Characteristics.

4.1.4.1 Folding Stock. The Modular Stock will be manipulated to verify its ability to fold and reduce the M40 Sniper Rifle’s overall length.

4.1.4.2 Ejection of Rounds. The ability to eject a spent or unfired round will be demonstrated with the Modular Stock unfolded with the cheek piece and the length of pull adjusted throughout their range of movement.

4.1.4.3 Bolt Manipulation. Bolt manipulation will be demonstrated with the Modular

Stock unfolded with the cheek piece and the length of pull adjusted throughout their range of movement.

4.1.5 Interface Requirements.

4.1.5.1 Sling Attachment. The Modular Stock will be inspected to verify the presence of sling mounting points as defined in 3.1.5.1. The sling swivels will be demonstrated to properly function with the Quick Cuff Model 2 sling. The M40 Sniper Rifle will be demonstrated to verify that the sling does not interfere with operation of the M40 Rifle.

4.1.5.2 Accessory Rails. The Modular Stock will be inspected to verify the possession of

MIL-STD-1913 compatible rails at the 3-, 6-, 9-, and 12-o’clock positions. The rail locations and numbering will be verified. The 3-, 6-, and 9-o'clock rails will be demonstrated for the capability to be removed.

4.1.5.2.1 Tripod Compatibility. The 6-o’clock rail will be demonstrated to be compatible with the M40 bipod and Sniper Weapon Tripod simultaneously.

4.1.5.2.2 Top Rail. The 12-o’clock rail will be verified to be either a rail that can support mounting and use of the SSDS and SSMRNS concurrently or a rail that will complement the current M40 Optical Rail by supporting SSMRNS mounting. The SSDS will be mounted using 1-inch high rings. If the 1-inch high rings are not compatible with the Modular Stock configuration, 1.5 inch high rings may be used instead. The location of any breaks in the 12-o’clock rail will be inspected to verify that breaks in the rail are not located under or between the

SSDS mounting rings or the SSMRNS mounting locks.

In order to demonstrate that the 12-o’clock rail is compatible with the existing M40 Optical Rail

(manufacturer: DD Ross; part # OP-700-SA-30) when the 12-o’clock rail does not accommodate both the SSDS and SSMRNS concurrently, the angles (left-right and front-to-back) of the M40

Optical Rail and the same angles of the vendor 12-o’clock rail will be measured with a Magnetic

Polycast Protractor and compared. The 12-o’clock rail must compare within 1 degree of the

M40 Optical Rail angles. This requirement is derived from the SSMRNS TM 11085B-OR/1, which states that “the SSMRNS can be rotated or tilted up to 1 degree with respect to the SSDS sight zero without affecting the SSDS boresight."

In order to demonstrate target engagement out to 914 meters with DODIC AB39 ammunition, operators will BZO their weapon at 100 yards. An operator must be able to apply a minimum of

15 mils of “up” elevation on the SSDS after zeroing at 100 yards the M40 Sniper Rifle.

4.1.5.2.3 Attached Accessories. All accessories listed in 3.1.5.2.3 will be attached and checked to verify that they can properly mount as described.

4.1.5.3 Magazines. The vendor-provided 10-round magazines and/or Badger Ordnance

5-round magazines will be used with the Modular Stock during each verification event which includes a magazine.

4.1.6 Maintainability.

4.1.6.1 Cleaning Materials. The Modular Stock manufacturer’s provided maintenance instructions will be analyzed for any special cleaner and lubricant requirements.

4.1.7 Environmental Conditions.

4.1.7.1 Corrosion Resistance. The Modular Stock will be subjected to the “Salt Fog” test and the “High Humidity” Test in accordance with TOP 3-2-045. Following testing, the Modular

Stock will be inspected for damage that would render the M40 Sniper Rifle unsafe to fire or affect the reliable functioning of the weapon. Following testing, the folding stock, cheek piece, length of pull, and bolt will each be manipulated to demonstrate full range of motion.

4.1.7.2 Chemical Resistance. Samples of the Modular Stock material will be subjected to

“Chemical Contamination” testing in accordance with TOP 3-2-045. The following chemicals will be applied to the stock: Reactive Skin Decontamination Lotion (RSDL); cleaning compound, solvent (MIL-L-372B, bore cleaner); dry cleaning solvent (P-D-680 type 1 or equivalent; lubricant, semi fluid (MIL-L-46000B, LSA; lubricant, cleaner and preservative

(MIL-L-63460A, CLP); turbine fuel (MIL-T-83133, JP-8); insect repellent (O-I-503E);

lubricating oil (MIL-L-14107, LAW).

4.1.8 Human Factors.

4.1.8.1 Firing Hand Grip. The Modular Stock will be demonstrated to verify that the firing hand grip provides positive control, is ergonomic and resists slipping of the firing hand.

4.1.8.2 Hand-hold Notch. The Modular Stock will be inspected for the inclusion of a hand-hold notch. The location of the notch will be demonstrated to show that it allows the shooter to apply rearward pressure to the shoulder for periods greater than 10 minutes without causing muscle fatigue. Use of the notch will be demonstrated to show that it is ambidextrous and minimizes hand fatigue during firing.

4.1.8.3 Recoil Transfer. The Modular Stock will be inspected for the inclusion of a recoil pad. The recoil pad will be demonstrated for the ability to adjust vertically and to lock in place with or without tools. The M40 Rifle built with the Modular Stock will be demonstrated by trained operators to verify that the stock design helps manage recoil and barrel lift during firing.

4.1.8.4 Cheek Piece. The cheek piece will be demonstrated to verify that the cheek piece can be adjusted vertically. The cheek piece will be demonstrated to verify that the cheek piece does not interfere with bolt manipulation in any position. The cheek piece will be demonstrated to verify the adjustability of the cheek piece without the use of Special Tools. The cheek piece will be demonstrated to verify the ability of the cheek piece to be locked in place without the use of tools. The cheek piece will be demonstrated to verify adjustability side-to-side and back/forth. The cheek piece will be demonstrated to verify adjustment to various heights between 2.5 inches below the optical centerline and 1.0 inch below optical centerline. The cheek piece will be demonstrated to verify that the cheek piece can be adjusted horizontally 7/8 inch to the left and right of the centerline of the stock. The cheek piece will be demonstrated to verify the ability of an operator to maintain consistent cheek weld pressure for each shot. All measurements will be made to the nearest 1/16 inch. If the 1.0 inch rings are not compatible with the SSDS on the Modular Stock, the cheek piece height adjustment will be demonstrated with the

SSDS using 1.5 inch rings.

4.1.8.5 Length of Pull. The Length of Pull of the Modular Stock will be demonstrated to be adjustable without the use of Special Tools. The length of pull adjustment range and increments will be measured to nearest 1/16”.

4.1.8.6 Body Alignment. The Modular Stock will be demonstrated for the ability to facilitate operator body alignment which minimizes physical strain when firing in the prone, standing, and sitting positions.

4.1.8.7 Magazine Release. The Modular Stock will be inspected for a magazine release that is external to the trigger guard. The magazine will be demonstrated to be removable by the operator in NBC gloves and cold-weather insert gloves (NSN: 8415-01-527-4665).

4.2 M40 SNIPER RIFLE REQUIREMENTS. All references to the M40 Sniper Rifle in this section indicate an M40 Sniper Rifle which has been assembled with the Modular Stock.

4.2.1 Physical Characteristics.

4.2.1.1 System Length. The M40 Sniper Rifle, without the suppressor, will be measured to the nearest 1/16” to verify the length.

4.2.1.2 Stock Design. The M40 Sniper Rifle will be placed on a flat, level surface with the bipod in its shortest position. A bubble level will be placed on the rail to determine if there is an upward angle.

4.2.2 Performance Characteristics.

4.2.2.1 Dispersion. Each M40 Sniper Rifle will be tested to verify dispersion. Testing of the M40 Rifles with SSDS for targeting and accuracy will be accomplished with the rifle held in a machine rest. Before each rifle is fired for record, up to ten shots may be fired to foul the bore, seat the weapon, settle the rifle action and sight the weapon. Five series of ten shots will be fired for a total of 50 shots. The mean radius will be calculated for each ten-shot group, and the average mean radius calculated for each rifle. An overall average mean radius will computed for each vendor.

4.2.2.2 Firing Rate. The M40 Sniper Rifle will be demonstrated to verify its capability of firing one round every three seconds for the duration of one magazine while allowing the operator to maintain cheek weld, spot weld, and sight alignment.

4.2.3 Reliability. Throughout reliability firing the modular stock will be inspected for damage that would render the M40 Sniper Rifle unsafe to fire or affect reliable functioning of the weapon.

4.2.3.1 Firing Schedule. The ammunition used for system reliability testing will be

DODIC AB39. Firing will occur at a rate between 5-10 rounds per minute.

4.2.3.2 Maintenance Schedule. The rifles and suppressors shall be cleaned and lubricated every 100 rounds using Government standard cleaners and lubricants.

4.2.3.3 Failure scoring. If one or more Stoppages are found to be related to an unserviceable part, replacement of the unserviceable part shall be scored as an Essential Function

Failure and the related Stoppages not scored.

4.2.3.4 Reliability Firing Schedule. If the Modular Stock is compatible with both the

Badger Ordnance 5-round magazine and Vendor provided 10-round magazine (see 3.1.5.3), then half of the rounds fired will be fired using the 5-round magazines, and half will be fired using the provided 10-round magazines. Firing will be performed as follows:

a. Three M40 Rifles shall fire 8,000 rounds each at ambient condition (77°F ± 18°F)

b. Three M40 Rifles shall fire 500 rounds each at -25ºF

c. Three M40 Rifles shall fire 1,500 rounds each at 120ºF

4.2.4 Maintainability.

4.2.4.1 Field Cleaning. The M40 Sniper Rifle will be demonstrated to verify the time required for the operator to remove the magazine, suppressor and bolt for field cleaning. The

M40 Sniper Rifle will be demonstrated to verify the time required to re-assemble the rifle from breakdown without tools. All times will be measured to the nearest second.

4.2.5 Environmental Conditions.

4.2.5.1 Rough Handling. Combat movement will consist of a stalk event conducted by

Marine Corps Scout Snipers during the Limited User Evaluation. Routine firing will consist of the firing events conducted by Marine Corp Snipers during the Limited User Evaluation. Prior to conducting the combat movements, the SSDS zero will be established in accordance with task

0317-M40-1003, “Zero the M40 Series Sniper Rifle”, from the Marine Corps Infantry T&R

Manual, NAVMC 3500.44A. After being subjected to routine firing and combat movement, the

Modular Stock will be inspected for damaged components, and the SSDS zero will be verified.

4.2.5.2 Sand/Dust. The M40 Sniper Rifle will be subjected to the “Sand and Dust” test in accordance with TOP 3-2-045. Throughout this test, the Modular Stock will be inspected for damage that would render the M40 Sniper Rifle unsafe to fire or affect the reliable functioning of the weapon. Throughout this test, the folding stock, cheek piece, length of pull, and bolt will each be manipulated to demonstrate full range of motion.

4.2.5.3 Water Submersion. The M40 Sniper Rifle will be submersed in water at a depth of two (2) feet for ten (10) minutes. The M40 will be removed from the water, allowed to drain for ten seconds with the action open and muzzle down. After allowing the water to drain, the

M40 will be fired through a full magazine of ammunition. Following this test, the Modular Stock will be inspected for damage that would render the M40 Sniper Rifle unsafe to fire or affect the reliable functioning of the weapon. Following this test, the folding stock, cheek piece, length of pull, and bolt will each be manipulated to demonstrate full range of motion.

4.2.5.4 Mud. The M40 Sniper Rifle will be subjected to the “Mud Test” in accordance with TOP 3-2-045. Throughout this test, the Modular Stock will be inspected for damage that would render the M40 Sniper Rifle unsafe to fire or affect the reliable functioning of the weapon.

Throughout this test, the folding stock, cheek piece, length of pull, and bolt will each be manipulated to demonstrate full range of motion.

4.2.5.5 Temperature Extremes. Temperature extremes verification will be conducted during system reliability testing (see 4.2.3). Throughout this test, the M40 Sniper Rifle will be inspected for damage and fired to verify safe operation. Firing will consist of 500 rounds per

M40 Sniper Rifle at -25 degrees F and 1500 rounds per M40 Sniper Rifle at 120 degrees F. The

M40 Sniper Rifles and ammunition will be conditioned for a minimum of 4 hours in the temperature chamber prior to firing. Firing will occur at a rate of 5-10 rounds per minute. M40

Sniper Rifles and suppressors will be cleaned and lubricated every 100 rounds using Government standard cleaners and lubricants. After cleaning, the M40 Sniper Rifles will be reconditioned for a minimum of 2 hours at the appropriate temperature prior to firing the next 100-round cycle.

Throughout this test, the folding stock, cheek piece, length of pull, and bolt will each be manipulated to demonstrate full range of motion.

4.2.6 Safety.

4.2.6.1 Safety Mechanism. Operators will employ the M40 Sniper Rifle to demonstrate the ability to manipulate the safety mechanism using the shooting hand and without changing the firing grip.

4.2.6.2 Safe Design. Systematic observations and analyses of the M40 Modular Stock shall be conducted throughout each verification method contained in this Purchase Description in order to identify and investigate any actual or potential hazards to personnel and equipment that may result from operation and maintenance of the item by representative users. If any unsafe characteristics in the Modular Stock design are discovered, the Modular Stock design may be rejected.

4.2.7 Human Factors.

4.2.7.1 Reload Time. The Reload Time of the M40 Sniper Rifle will be demonstrated by trained operators, in the prone position, and with a ready magazine. Reload time shall be the time from when the magazine release is actuated until the operator positively seats the next magazine in the magazine well.

4.2.7.2 Clothing/Gear Compatibility. The M40 Sniper Rifle will be demonstrated for its capability to be employed by an operator wearing Mission Oriented Protective Posture (MOPP) gear (gas mask, NBC gloves, and charcoal suit—a fleece jacket and Gore-Tex can be used in place of the charcoal suit).

5. PACKAGING

5.1 GENERAL. The packaging requirements shall be as specified in the contract.

6. NOTES

6.1 DEFINITIONS. For the purpose of this Purchase Description, the following definitions apply.

6.1.1 Analysis. An element of verification that uses established technical or mathematical models or simulations, algorithms, charts, graphs, circuit diagrams, or other scientific principles and procedures to provide evidence that stated requirements were met.

6.1.2 Demonstration. An element of verification that involves the performance of operations at the system/sub-system level and in which observations are the primary means of verification. A demonstration may rely on feedback from representative users of the system in order to verify achievement of the requirement. Demonstration is used when quantitative assurance is not required for verification of the requirements.

6.1.3 Essential Function Failure. An Essential Function Failure is one or more of the following system-induced, not operator-induced, actions:

1. Any stoppage that cannot be corrected within 10 seconds

2. Any unserviceable part that must be replaced. Replacement of the barrel or suppression system after their scheduled lifespan does not constitute an

Essential Function Failure.

3. Occurrence of a crack in the bolt, barrel or receiver.

6.1.4 Inspection. An element of verification that involves visual inspection of equipment and evaluation of drawings and other pertinent design data and processes. Inspection is conducted in order to verify conformance with required physical or material characteristics.

6.1.5 Reliably Function. To reliably function indicates that the weapon functions with no apparent degradation of reliability. Significant increases in the number of failures during individual tests shall be noted and further investigated.

6.1.6 Phase-1 Testing. This test phase will include build, initial inspection and demonstrations, and dispersion firing.

6.1.7 Phase-2 Testing. This test phase will consist of the Limited User Evaluation and reliability testing.

6.1.8 Phase-3 Testing. This test phase will consist of environmental testing and the completion of reliability testing.

6.1.9 Safely Function. To safely function indicates that the weapon continues to function properly and that no events occur that would cause doubt as to whether the weapon is safe for use.

6.1.10 Special Tools. Special Tools are those tools that are not already assigned a

National Stock Number with the Marine Corps as a user.

6.1.11 Stoppage. A Stoppage is defined as any incident resulting in the unplanned cessation of firing or the inability to commence firing.

6.1.12 Test. An element of verification that is designed to provide data on functional features and equipment operation in an operational environment under fully controlled and traceable conditions. This data is subsequently used to evaluate quantitative characteristics.

Evaluation includes comparison of the demonstrated characteristics with requirements. Tests are conducted when an acceptable level of confidence cannot be established by other methods, or if testing is shown to be the most cost effective method.