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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.
It was the standard-issue rifle of the South African Marine Corps and South African Air Force, as well within the South West African Territorial Force as a substitute for the R1 Rifle (FN FAL) until it was replaced by the R4 assault rifle in the 1980s [54] The rifle's stock would soon break down in the heat and become loose, so a replacement ...
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.
In 2007, United States Secretary of the Army Pete Geren agreed to hold a "dust chamber" test pitting the M4 against the Heckler & Koch HK416 and XM8, as well as the rival FN SCAR design. The Heckler & Koch XM8 and FN SCAR had the fewest failures in the test, closely followed by the HK416, while the M4 had by far the most. [23]
One of the biggest upgrades that may be implemented is the replacement of the standard flat-top upper receiver with standard handguards, handguard end cap and front sight base with a monolithic upper receiver with integrated aluminium quad-rail handguard for increased modularity with accessories and free-floating the barrel for augmented precision.
The G36 uses a short-stroke piston system [2] from which HK later developed the HK-416's impingement system. Unlike direct impingement, the system uses gas trailing the bullet to operate the piston instead of pushing directly on the bolt. The G36's bolt is operated by a cam that guides the bolt carrier by its respective cut-out.