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The M16 rifle (officially designated Rifle, Caliber 5.56 mm, M16) is a family of assault rifles adapted from the ArmaLite AR-15 rifle for the United States military. The original M16 rifle was a 5.56×45mm automatic rifle with a 20-round magazine.
ArmaLite AR-15 with the charging handle located on top of the upper receiver, protected within the carrying handle and a 25-round magazine. 1973 Colt AR-15 SP1 rifle with "slab side" lower receiver (lacking raised boss around magazine release button) and original Colt 20-round magazine.
Rifles styled like the AR-15 come in many sizes and have many options, depending on the manufacturer. The lower receiver, without the receiver extension, rear takedown pin, and buttstock, is shown at bottom. An AR-15–style rifle is a lightweight semi-automatic rifle based on or similar to the Colt AR-15 design.
The ArmaLite AR-15 [note 3] is a gas ... and backward = full-auto of the M16 rifle. [52] The only major difference between the 601 and 602 is the switch from the ...
The CAR-15 name was an attempt to re-associate the AR-15 name with Colt, since the AR initially stood for ArmaLite, the original manufacturer of the ArmaLite AR-15. Colt later abandoned the CAR-15 concept, but continued to make carbine variations, using the " M16 " brand for select-fire models and the " Colt AR-15 " brand for semi-automatic models.
The M16 continues to benefit from every advance in the CNC field, [94] which allows more and more small manufacturers to mass-produce M16s and semi-automatic AR-15 type rifles. [ 95 ] [ 96 ] [ 97 ] [ notes 1 ] The M16's aluminum lower receivers may be forged or cast . [ 98 ]
The AR-15 uses an L-type flip, aperture rear sight and it is adjustable with two settings, 0 to 300 meters and 300 to 400 meters. [16] The front sight is a post adjustable for elevation. The rear sight can be adjusted for windage. The sights can be adjusted with a bullet tip or pointed tool. The AR-15 can also mount a scope on the carrying handle.
The ArmaLite AR-15, officially designated Rifle, caliber 5.56 mm, M16, was later adopted by U.S. infantry forces as the standard-issue rifle. [ 5 ] [ 10 ] Here is a table comparing rifles based on a maximum ammunition load in box magazines of 10 kg (22 lb).