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[73] [74] The military M4 carbine typically uses a 14.5-inch (37 cm) barrel. Civilian rifles commonly have 16-inch (41 cm) or longer barrels to comply with the National Firearms Act. [75] To prevent a civilian semi-automatic AR-15 from being readily converted for use with the select fire components, several features were changed.
The Colt AR-15 is a product line of magazine-fed, gas-operated, autoloading rifle manufactured by Colt's Manufacturing Company ("Colt") in many configurations. [1] The rifle is a derivative of its predecessor, the lightweight ArmaLite AR-15, an automatic rifle designed by Eugene Stoner and other engineers at ArmaLite in 1956.
Eugene Morrison Stoner (November 22, 1922 – April 24, 1997) was an American machinist and firearms designer who is most associated with the development of the ArmaLite AR-15 rifle that was redesigned and modified by Colt's Patent Firearm Company for the United States military as the M16 rifle.
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 ...
11.5 in. A1 1:12 No 4.5" Moderator or A1 639 Colt SMG: 2nd Short Ribbed S-1-3 A1 No Yes 9mm NATO 10 in. A1 w/ integral silencer: 1:10 No A2 Compensator 640: XM177 Commando: 2nd Generation Short Ribbed S-1-F A1 No No .223 REM 11.5 in. A1 1:12 No 4.5" Moderator or A1 645: M16A1E1: A1 Ribbed S-1-3 A2 Yes Yes 5.56 NATO 20 in. A2 1:7 Yes A2 ...
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.
5.56×45mm NATO: Howa Machinery Company, Sterling Armaments Company: Semi-automatic rifle version of the AR-18. AR-100 AR-101 AR-102 AR-103 AR-104: 5.56×45mm NATO: ArmaLite, Elitool: AR-100 series [4] based on the AR-16 that used a self ejecting magazine device. [5] Used in development of Ultimax 100 LMG. AR-30, AR-30A1, AR-31
The 6.5 Grendel bullets have a true diameter of 6.71mm / 0.264" and the 6.5 Grendel case can be formed from abundant 7.62x39 cases with a neck re-sizing die, and fire-forming a slight change to the shoulder, if the case is made from brass. Many of the popular 7.62x39 cases are made from steel, which will not work for reforming the shoulder.