Colt Advanced Piston Carbine
type of assault rifle/carbine
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. The design incorporates an articulating link piston that reduces the stresses in the piston stroke by allowing for deflection and thermal expansion.
Colt submitted the APC as the “Enhanced M4” for the U.S. Army's Individual Carbine competition to replace the M4 carbine in 2012. However, the competition was canceled in 2013 before a winning weapon was chosen. The APC was adopted in limited quantities by several military and law enforcement agencies.
Design
The weapon has a suppression-ready fluted barrel, which is lighter and cools better than previous M4 barrels. It is claimed to have "markedly better" accuracy. To improve reliability, Colt used an articulating link piston (ALP) which "reduces the inherent stress in the piston stroke by allowing for deflection and thermal expansion". In traditional gas piston operating systems, the force of the piston striking the bolt carrier can push the bolt carrier downwards and into the wall of the buffer tube, leading to accelerated wear and even chipped metal. This is known as carrier tilt.
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