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The M16 is a lightweight, 5.56 mm, air-cooled, gas-operated, magazine-fed assault rifle, with a rotating bolt. The M16's receivers are made of 7075 aluminum alloy, its barrel, bolt, and bolt carrier of steel, and its handguards, pistol grip, and buttstock of plastics.
This article describes the many variations of the Colt AR-15 and M16 rifle family of weapons produced by Colt's Manufacturing Company. Weapons patterned on the original ArmaLite AR-15 design have been produced by numerous manufacturers and have been used by nations around the world, some of which created their own variations.
The Colt Automatic Rifle or Colt Light Machine Gun is a 5.56 mm NATO, open-bolt, full-automatic-only firearm developed by Colt Defense.It is based on the M16A2/A4, and has a distinctive squared-off handguard, vertical grip, carrying handle and integrated bipod.
A standard M16 handguard had 2.5 inches cut off the back to fit the shortened barrel/gas system, and a custom adapter fabricated to retain the modified handguard in the existing retainer ring surrounding the barrel nut. As an added benefit from the relocated front sight/gas block a bayonet was able to be fitted.
U.S. Marines in November 2001 armed with M16A2 rifles equipped with AN/PEQ-2s.. The AN/PEQ-2 succeeded the AN/PAQ-4C, which was designed in the early 1990s after the Persian Gulf War. [4]
The M203 unmodified to an A1/A2 series will not fit on the M4 carbine series. The U.S. M203A1 has a barrel of 12 inches, while the SOPMOD M203A1 has a 9 in (23 cm) barrel. The M203A1 is intended for use with the M4 and M4A1 carbines, and uses a special bracket mount consisting of three screws and lacing wire.
As of May 2020, the Springfield Armory website lists three different SAINT rifle offerings, each of which features an M-LOK handguard and M16 (non-enhanced) bolt carrier group; one has flip-up sights and two have an A2 (fixed front) sight.
The C7 series of firearms is driven by the same Stoner bolt and carrier gas system as the M16 series. Like the M16A1 and M16A3 , the C7 has both semi-automatic and fully automatic fire modes. The C7 also features the structural strengthening, spent case deflector, improved handguards, and longer stock developed for the M16A2.