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The only major difference between the 601 and 602 is the switch from the original four grooves, right-hand 1:14-inch (1:355.6 mm or 64 calibers) rifling twist rate to the more common four grooves, right-hand 1:12-inch (1:304.8 mm or 54.8 calibers) twist. This was done as the original 1:14-inch twist rate to just stabilize the 55 grain bullet ...
The AR-15's most distinctive ergonomic feature is the carrying handle and rear sight assembly on top of the receiver. This is a by-product of the original ArmaLite design, where the carry handle served to protect the charging handle. [14] As the line of sight is 2.5 in (63.5 mm) over the bore, the AR-15 has an inherent parallax problem. At ...
ArmaLite, or Armalite, is an American small arms engineering company, formed in the early 1950s, in Hollywood, California.Many of its products, as conceived by chief designer Eugene Stoner, relied on unique foam-filled fiberglass butt/stock furniture, and a composite barrel using a steel liner inside an aluminum sleeve, including the iconic AR-15/M16 family.
After Colt's patents expired in 1977, an active marketplace emerged for other manufacturers to produce and sell their own semi-automatic AR-15–style rifles. [1] Some versions of the AR-15 were classified as "assault weapons" and banned under the Federal Assault Weapons Ban in 1994 within the United States. This act expired in 2004. [2] [22]
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1:12 No Type 2 Duckbill 605B Model 605B: A1 Triangular S-F-1-3 A1 No No .223 REM 15 in. A1 1:12 No Type 2 Duckbill 606 CAR-15 Heavy Assault Rifle M1: A1 Triangular S-1-F A1 No No .223 REM 20 in. HBAR 1:12 Yes Type 2 Duckbill 606A CAR-15 Heavy Assault Rifle M1: A1 Triangular S-1-F A1 Yes No .223 REM 20 in. HBAR 1:12 Yes Type 2 Duckbill 606B
The rifle itself is offered in two variants: the S-5.56 A1 with a 19.9-inch barrel and 1:12 pitch rifling (1 turn in 305 mm), optimized for the use of the M193 Ball cartridge; and the S-5.56 A3 with a 20-inch barrel and a 1:7 pitch rifling (1 turn in 177, 8 mm), optimized for the use of the SS109 cartridge.
The M14 rifle, officially the United States Rifle, Caliber 7.62 mm, M14, is an American battle rifle chambered for the 7.62×51mm NATO cartridge.It became the standard-issue rifle for the U.S. military in 1957, replacing the M1 Garand rifle in service with the U.S. Army by 1958 and the U.S. Marine Corps by 1965; deliveries of service rifles to the U.S. Army began in 1959.