SOPMOD

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SOPMOD Block I

The Special Operations Peculiar MODification (SOPMOD) kit is an accessory system for the M4A1 carbine, CQBR, FN SCAR Mk 16/17, HK416 and other weapons used by United States Special Operations Command (USSOCOM). The kit is not specific to USSOCOM, however. The kit allows American Special Operations personnel to configure their weapons to individual preferences and mission requirements.

The program dates back to September 1989, when the Special Operations Special Technology (SOST) Modular Close Combat Carbine Project was founded. The Material Need Statement (MNS) was signed on May 1992, and by September 1993, the Operational Requirements Document (ORD) for the program was validated. Responsibility for the program was then assigned to the Naval Surface Warfare Center Crane Division.

The SOPMOD kit is composed mostly of non-developmental and commercial off-the-shelf (NDI/COTS) accessories packaged together to support four M4A1 carbines.

Accessories[]

The original SOPMOD Block I kit included all of the following:

Only two of following were included per kit:

Only one of the following was included per kit:

If more of the accessories are needed, it is typical for units to "cannibalize" the kits of inactive teams. The documentation for the kit does not require a rewrite if improved replacements for any of the current items can be found. As a result, this content list has changed. For instance, on many SOPMOD M4s today, the Crane Sloping Cheekweld Stock has been added. Several potential additions include the M26 Modular Accessory Shotgun System and the M320 grenade launcher. Also, various EOTech holographic sights are used on many SOPMOD configured M4s. The SOPMOD kit allows for the attachment of any Picatinny compatible accessory that fits the length of the weapon.

Block I phased replacements[]

  • Daniel Defense M4A1 RIS II and RIS II FSP, full-length handguards using a gas block without a front sight
  • Insight Technology M3X Tactical Illuminator (SU-233/PVS)
  • Insight Technology M6X Tactical Laser Illuminator (SU-238/PVS)
  • EOTech 553 HOLOgraphic Weapon Sight (SU-231/PEQ)
  • Trijicon ACOG TA01 ECOS 4x Scope (SU-237/PVS)
  • AN/PVS-17 Product Improvement Kit
  • BUIS II

Block II[]

  • Insight Technology LA-5/PEQ
  • Insight Technology CNVD-T Thermal Sight (SU-232/PAS)
  • L3-EOTech 553 HOLOgraphic Weapon Sight (SU-231/PEQ)
  • L3-EOTech EXPS3-0 HOLOgraphic Weapon Sight (SU-231A/PEQ) [FDE]
  • L3-EOTech G33.STS 3x Magnifier [Tan Anodized/FDE]
  • L3-EOTech M40GL Grenade Launcher Sight (SU-253/PEQ ECOS-GL)
  • Raytheon Company Elcan SpecterDR 1-4x Scope (SU-230/PVS)
  • Trijicon ACOG + Docter RDS (SU-237/PVS Sight Unit)
  • AN/PVS-24 Night Vision Device
  • Daniel Defense RIS II Series (FSP/Non FSP/GL, FDE)
  • Insight M3X Light (SU-233/PVS Gun Light)
  • Insight WMX200 Gun Light
  • WSC (Weapon shot counter)
  • SOPMOD Gen 1/2 Stock (The Gen1 buttstock does not have the QD sling connector, so slings were attached through the slats in the back and tied on; Later, LMT introduced the Gen 2 stock that had the connector.)
  • KAC Front Sight
  • KAC Micro Rear BUIS
  • Tango Down VFG
  • KAC "Broomhandle" VFG

Upper Receiver Group, Improved (URG-I) or Block III[]

Unofficially dubbed the "Block III", the URG-I was initially fielded by the United States Army Special Operations Command (USASOC) to replace the current Block II base upper receiver group. Available in both 14.5" and 11.5" lengths, the URG-I was designed to provide end users with a lightened upper with increased parts life,[1] while maintaining modularity with various accessories. Though primarily issued to USASOC personnel, the URG-I upper receiver has seen usage in Air Force Special Operations Command (AFSOC) as well as other components within SOCOM. The new URG-I boasts accuracy as good as 1MOA or less with match ammo, and the 14.5" barrel can withstand up to 31,000 rounds of the newer, higher pressure M855A1 ball ammunition. However, reports of shorter barrel upper receiver groups (10.3 and 11.5) having sheared or cracked bolts after 3,000 rounds are common.

  • Colt M4 receiver (from stock M4 carbines)
  • Daniel Defense 14.5" CHF barrel with mid-length gas system, also available in 11.5" with carbine length gas system
  • Daniel Defense pinned gas block
  • Geissele Mk16 Super Modular Handguard in Desert Dirt Color anodize
  • Geissele Airborne charging handle in Desert Dirt Color anodize
  • Colt M16 bolt carrier group (also from stock M4 carbines)
  • Geissele Super Select Fire trigger as requested by operator
  • Surefire 4-prong SOCOM flash hider
  • M-lok interfaced commercially available accessories as needed by operator
  • Various optical mounts available commercially as preferred by operator

References[]

  1. ^ "NSWC-Crane Mid-Length Gas System Testing Shows Increased Performance & Service Life for M4 Carbines - Soldier Systems Daily".

External links[]

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