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A2 1:9 Yes A2 AR6530 AR-15 Lightweight A2 Short Ribbed S-1 A2 Yes Yes .223 REM 5.56 NATO 16 in. A1 1:7 Yes A2 AR6551 AR-15 Target Model A2 Ribbed S-1 A2 Yes Yes .223 REM 5.56 NATO 20 in. A2 1:7 Yes A2 AR6601 AR-15 Match HBAR A2 Ribbed S-1 A2 Yes Yes .223 REM 5.56 NATO 20 in. HBAR 1:7 Yes A2 AR6700 AR-15 Competition HBAR A2 Ribbed S-1 Flattop ...
The standard XM-15 has a forged 7075T6 aircraft-grade aluminum upper and lower receiver. Barrels of XM-15 firearms have a heavy profile and are hard chrome-lined 4150 alloy steel or 416 stainless steel. [2] [4] In Bushmaster's 2016 sales brochure, all new-production XM-15s are stated to be supplied with a 4150 steel barrel. [5]
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 first version produced for commercial sale by Colt was the SP1 model AR-15 Sporter in .223 Remington, with a 20-inch (51 cm) barrel and issued with five-round magazines. [21] Initial sales of the Colt AR-15 were slow, primarily due to its fixed sights and carry handle that made scopes difficult to mount and awkward to use. [84]
The Mk47 Mutant has an AR-10-sized bolt carrier, [8] which was enlarged, with a CMMG RKM KeyMod handguard [3] [5] and an upper/lower receiver manufactured from 7075-T6 billet aluminum. [2] The rifle has an AR-15-based pistol grip, safety selector, trigger group and a buffer tube. [2] It was influenced by the CMMG Mk3 assault rifles. [9]
The AR-15 was later adopted by United States military forces as the M16 rifle. [7] [8] After ArmaLite sold the rights to the AR-15 to the Colt Firearms Company, Stoner turned his attention to the AR-16 design. This was another advanced 7.62 mm rifle but used a more conventional short-stroke piston and a number of stamped parts to reduce cost.
Between 1964 and 1965, Colt began to expand the AR-15 beyond the realm of an infantry/assault rifle with the development of light machine gun weaponry. The result was the Model 606 series. [5] Colt made two of the model 606, called A and B models. The A model “featured forward assist devices found on the Colt 603 rifles.”
The Armalite AR-15 is the parent of a variety of Colt AR-15 and M16 rifle variants. History After World War II, the United States military started looking for a single automatic rifle to replace the M1 Garand , M1/M2 Carbines , M1918 Browning Automatic Rifle , M3 "Grease Gun" and Thompson submachine gun .