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The M16's action works by passing high-pressure propellant gasses, tapped from the barrel, down a tube and into the carrier group within the upper receiver. The gas goes from the gas tube, through the bolt carrier key, and into the inside of the carrier where it expands in a donut-shaped gas-piston cylinder.
Note the multiple serrations on the side of the bolt carrier that interface with the device seen through the ejection port The forward assist is a button found on firearms with non-reciprocating (i.e. not attached to the bolt/bolt carrier) cocking handles, commonly on AR-15 rifle derivatives, such as the M16 rifle , and is usually located on ...
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.
This is also referred to as the "major" diameter in the information below. It indicates the diameter of smooth-walled hole that a male thread (e.g. on a bolt) will pass through easily to connect to an internally threaded component (e.g. a nut) on the other side. For example, an M6 screw has a nominal outer diameter of 6 millimetres and will ...
The M16 is a select-fire, 5.56×45mm, air-cooled, internal-piston gas-operated, magazine-fed rifle, with a rotating bolt and straight-line recoil design. Above all else, the M16 was designed to be a lightweight assault rifle and to fire a new lightweight, high-velocity small caliber cartridge to allow the soldier to carry more ammunition. [ 36 ]
This is not the case in the M16 design in which gases are tapped off the barrel near the muzzle and flow through a tube to directly impinge on the bolt to initiate the auto loading cycle. In a standard issue M16, the gas tube is roughly 16 inches (410 mm) long to produce an automatic (cyclic) rate of fire of approximately 650 rounds per minute.