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ArmaLite Early ArmaLite AR-15 ultra-lightweight 'Hollywood' turned-down profile barrel, 1:14 twist only; A1: Also referred to as the "lightweight" or "pencil" profile. Government-specified barrel profile increased to between 0.675 and 0.575 inches; A2: Also referred to as the "government" or "gov't" profile. Barrel profile for which the portion ...
The M16A2 weighs 8.8 lb (4.0 kg) loaded with a 30-round magazine, because of the adoption of a thicker barrel profile. The thicker barrel is more resistant to damage when handled roughly and is also slower to overheat during sustained fire. Unlike a traditional "bull" barrel that is thick its entire length, the M16A2's barrel is only thick ...
Conventional eight groove rifling on the left, and octagonal polygonal rifling on the right. Polygonal rifling (/ p ə ˈ l ɪ ɡ ə n əl / pə-LIG-ə-nəl) is a type of gun barrel rifling where the traditional sharp-edged "lands and grooves" are replaced by less pronounced "hills and valleys", so the barrel bore has a polygonal (usually hexagonal or octagonal) cross-sectional profile.
Any AR-15/AR-10 cartridge cases that are derived from the 7.62x51 can also be formed from these listed calibers. (7.62x51 & .308 are similar in external dimensions though the Brass has different internal capacity and Max PSI recommendations are different & Chambers are different.) AR-10 :The AR-10 is slightly larger and heavier than the AR-15 ...
The family name was derived from the original AR-15 by adding "Colt", resulting in the CAR-15, to stand for Colt Automatic Rifle, even though the "AR" in AR-15 stands for Armalite Rifle, the original manufacturer. [3] The CAR-15 weapons system consisted of the AR-15 and five variations, including the Colt Machine Gun and CAR-15 Heavy Assault ...
In May 2008, Smith & Wesson introduced their first AR-15 style rifle in a new caliber, the model M&P15R, a standard AR platform rifle chambered for the Russian 5.45×39mm cartridge. [11] This was due to the availability cheap surplus Communist Bloc 5.45mm ammunition and AK-series weapons. [ 11 ]
The Ruger AR-556 is a semiautomatic AR-15 style rifle manufactured by U.S. firearms company Sturm, Ruger & Co. Introduced in 2014 as an entry-level AR-15 using a direct impingement action, with variants since being released such as the upgraded AR-556 MPR (multi-purpose rifle) in 2017 [1] and the AR-556 pistol in 2019.
Barrel nut Attaching the barrel to the receiver using a barrel nut and a barrel with a shoulder is an alternative to action threads, which has been used in firearms such as the Sten gun and AR-15. Hand tools Quick barrel change systems is an increasingly popular alternative, as seen in for example SIG Sauer 200 STR, Roessler Titan or Blaser R8.