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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) special forces units, though it is not specific to SOCOM.
The Heckler & Koch HK416 is an assault rifle chambered for the 5.56×45mm NATO cartridge.It is designed and manufactured by the German company Heckler & Koch.. Although the design is based on the AR-15 class of firearm (specifically the Colt M4 carbine family issued to the U.S. military), it uses a proprietary short-stroke gas piston system from Heckler & Koch's earlier G36 family of rifles.
The M27 Infantry Automatic Rifle (IAR) is a 5.56mm, select-fire assault rifle / squad automatic weapon developed from the HK416 by Heckler & Koch.It is used by the United States Marine Corps (USMC) and was originally intended for automatic riflemen, [6] but now is issued to all infantry riflemen as a replacement for the M4 carbine.
The HK417 is similar in internal design to the HK416, although the receiver and working parts are enlarged to suit the larger 7.62×51mm cartridge.The bolt is a seven-lug rotating type, which sits in a bolt carrier and operates in a forged alloy receiver resembling those of the Stoner-designed AR-10, AR-15 and M16 rifles.
The Heckler & Koch HK433 is a modular assault rifle originally chambered for 5.56×45mm which combines features of the G36 and the HK416 families of assault rifles. [1] The HK433 was designed by Heckler & Koch to be familiar to operators with experience using the Heckler & Koch G36 and HK416 platforms. All controls are ambidextrous, and major ...
Cold-hammer forged steel barrels such as those used on the HK416 have a service life of 20,000 to 50,000 rounds depending on the intensity of use. [283] [256] [285] A badly worn M16 barrel will cause the bullets to tumble in flight. [286]
The materials used to build the XM8 are almost entirely composites, with the notable exception of the cold-hammer-forged steel barrel. Preliminary tests in desert and arctic conditions have shown the XM8 to be a rugged weapon, though some complaints arose concerning an unspecified mechanical issue and melting handguards due to overheating when ...
The MG4 has a hammer-forged quick-change barrel that can be safely exchanged when hot without the need for protective gloves; the carrying handle serves as the barrel change grip. The barrel assembly weighs 1.80 kg (3.97 lb). To reduce the overall length of the weapon for transport, the butt stock can be folded to the left side of the receiver.