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U.S. Marines Issue Another RFI For Suppressors For M4s & M27 IARs

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The U.S. Marines are betting heavily in using suppressors as they slowly build-up putting cans into the rifles and support weapons for the Devil Dogs. I wrote here last December that the 2nd Marine Division wants to put suppressors in every weapon with the Bravo Company, 1st Battalion, 2nd Marines, deployed in Norway happy with the exercises they conducted using suppressors last May, the U.S. Marines issued an RFI for suppressors.

Now, they are issuing a second RFI for suppressors that can be used with the M4, M4A1, and M27, with a probability of future purchases between 18,000 and 194,000. The following are the minimum requirements for the suppressors to be considered:

1. The suppressor should be capable of detachment/attachment and disassembly/ reassembly by an operator in the field without the use of special tools for normal care and cleaning.

2. Suppressor should enable a noise level of 139 decibels or lower at either of the shooters ears.

3. Suppressor should be a design that minimizes the change in the host rifle internal operating system dynamics.

4. Suppressor may be of the over the barrel, or flush mount design and should not be longer than 20" total barrel length (threshold), 18" (objective). 

5. Suppressor should be of the quick detachable design.  A special muzzle device may be attached (by a unit Armorer) to the OEM weapon in order to facilitate installation and removal by an operator.

6. Must be able to withstand the sustained rate of the M27 IAR (capable of a rate of fire of 36 rounds per minute for 16 minutes, 40 seconds with firing starting at ambient temperature for a 600 round load).

7. The entire suppressor and muzzle device should weigh no more than 18 oz.

8. The use of the suppressor should not increase the dispersion of each respective weapon.  It is acceptable for the weapon to experience a repeatable shift in the zero between unsuppressed and suppressed operating modes, but that shift should not exceed 3 MOA for each respective weapon.

9. The suppressed weapon should  retain its dispersion through the life of the barrel (objective of 24,000 rounds)

10. The suppressor system is not required to have an internal projectile pathway which is the usual industry standard for a 5.56mm diameter round.  The internal bullet channel may be larger than is typical of current suppressor designs.  In other words, the suppressor may be able to be employed on multiple calibers (i.e. A059 Ball, AB49, AC12, AB57 etc.) without any modification to the suppressor.  This attribute not only facilitates future caliber/weapon capabilities, but could also mitigate baffle strikes.

11. Suppressor should function with all Department of Defense Identification Code (DODIC) 5.56 mm ammunition, including A059 Ball, A063 Tracer, A080 Blank, AA33 Ball, AA53 Ball Special Match, AA69 Armor Piercing, AB49 Ball Carbine barrier, AC12 and AB57 Enhanced Performance Round.

12. Suppressor should not require permanent configuration changes to the weapon system.

13. Suppressor should not inhibit the mounting or operation of the M203 or M320 grenade launchers (objective).

14. Suppressor should not require the addition of a gas mitigating charging handle.

15. Should be able to accept a suppressor sleeve in order to reduce thermal signatures and mitigate operator burns.

16. All suppressor external surfaces should have a dull, low-reflective finish (to include pins, bolts, lanyards, sight posts, etc.).  The external color of the system should be consistent with current camouflage colors and patterns.

17. The suppressor material should be able to accept approved USMC paint (e.g. rattle-can spray paint)

18. Suppressor should be resistant to corrosion, abrasion, impacts and chemicals, including standard Chemical, Biological, Radiological and Nuclear (CBRN) decontaminants.

19. The suppressor should resist maritime corrosion and/or effects of carbon/copper/lead fouling. 

  • MIL-L-46000C - Lubricant, Semi-fluid (Automatic Weapons)
  •  MIL-PRF-372D - Cleaning Compound, Solvent (Bore of Small Arms and Automatic Aircraft Weapons) 
  • MIL-PRF-14107D - Lubricating Oil, Weapons, Low Temperature
  • MIL-PRF-63460D - Lubricant, Cleaner and Preservative for Weapons and Weapons Systems

20. The suppressor should not require a more frequent cleaning schedule than the weapon system.

21. The system, with suppressor attached should continue to operate and safely function after exposure to blowing dust, mud, salt fog, rain, and icing/freezing rain environments as specified in US Army Development Test Operations Procedure (TOP) 3-2-045 (Small Arms - Hand and Shoulder Weapons and Machineguns) dated Sep 2007.

22. The system, with suppressor attached should be able to withstand the shock from a user performing individual movement techniques in combat, and the vibrations of being transported in standard military aircraft and ground vehicles as loose cargo, without degradation of performance.

23. The system, with suppressor attached should continue to safely function after being dropped in any orientation from a 1.7 meter height onto a smooth concrete or steel surface at temperatures ranging from -25º Fahrenheit (F) to 140º F.  The addition of the suppressor on the weapon system should not result in a discharge when dropped from this height.

24. The system, with suppressor attached should safely function through a temperature range of -25º F to +140º F without degradation of performance.

25. The addition to the suppressor, request information on the ability of industry to provide a BFA type suppressor (that looks like, operates like and weighs the same as the live fire suppressor).  This BFA type suppressor should be capable of catching a live 5.56mm round.  This BFA suppressor should also be easily distinguished as a training device only.

U.S. Marine Corps Photo, by Sarah N. Petrock

It looks like the vendors interested in responding to the RFI have  their work cut-out with this long list of “minimum” requirements, but the USMC have good reasons to insure that the list can get the effective cans for use in the field by the Marines.

The U.S. Marines are happy with the results of their tests with suppressors during the exercises in Norway according to Military.com. The use of suppressors have allowed the members of the units to communicate effectively, which if under the louder din of weapons fire, would make verbal communications tedious and affect coordination:

"It used to be a squad would be dispersed out over maybe 100 yards, so the squad leader couldn't really communicate with the members at the far end because of all the noise of the weapons," he said. "Now they can actually just communicate, and be able to command and control, and effectively direct those fires."

Another thing about why suppressors are also preferred, they allow the soldiers to be more stealthy when firing.

Furthermore, and more for health reasons, is that with the use of suppressors, there will be no need to use ear protection as unsuppressed M4s and M249s can cause a temporary hearing loss at 159 to 164 decibels according to Popular Mechanics.  It can contribute permanent hearing loss in the long run.

We’ll find out soon if the USMC will become fielding units that come with fully suppressed weapons. If that indeed happens, they can become more stealthy and better coordinated as they can put minimize the problem of noise as they go into battle.

 

Top photo: U.S. Marine at Camp Lejeune, N.C., Sept. 3, 2015 (USMC photo by by Cpl. Paul S. Martinez)

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