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The Colt Advanced Piston Carbine or Colt APC (internal product number P0923) is a lightweight modular 5.56mm caliber piston-operated, magazine fed carbine with a one-piece upper receiver which is capable of firing in automatic and semi-automatic modes.
Lacking a buttstock or buffer tube, the OA-93 disperses recoil through a specially designed flat top upper receiver similar to the Armalite AR-18. [ 1 ] [ 2 ] However, the passage of the 1994 Crime Bill required Olympic Arms to perform modifications to the basic design to continue selling them:
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The Ares Defense Shrike 5.56 is an air-cooled, dual-feed light machine gun/rifle for semi or full-auto configurations that fires the 5.56×45mm NATO cartridge. The Shrike 5.56 is sold as either as a complete weapon, or as an upper receiver "performance upgrade kit" to existing AR-15 and M16-type service rifles and carbines.
The standard Model 645 M16A2 has a safe/semi/three-round burst selective fire trigger group. It became standard issue for the U.S. Marine Corps and Army. There is also a safe/semi/three-round burst/automatic selective fire trigger group Model 708 version of M16A2 rifle named "M16A2 Enhanced", used by some militaries around the world. [206]
The model adopted by the JSDF is the so-called standard type with a metal tube stock, and it has unique modifications such as a different shape for the barrel change lever. The side of the gun body is marked with 5.56mm Machine Gun MINIMI. A distinctive feature is the unique heat cover (upper sleeve) mounted on the top of the barrel.
According to a PDF detailing the M4 Carbine improvement plans released by PEO Soldier, the direct impingement system would be replaced only after reviews were done comparing the direct impingement system to commercial gas piston operating system to find out and use the best available operating system in the U.S. Army's improved M4A1. [36]
A disassembled Mauser action showing a partially disassembled receiver and bolt. In firearms terminology and law, the firearm frame or receiver is the part of a firearm which integrates other components by providing housing for internal action components such as the hammer, bolt or breechblock, firing pin and extractor, and has threaded interfaces for externally attaching ("receiving ...