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  2. AR-15–style rifle - Wikipedia

    en.wikipedia.org/wiki/AR-15–style_rifle

    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]

  3. List of AR platform cartridges - Wikipedia

    en.wikipedia.org/wiki/List_of_AR_platform_cartridges

    The AR-15 rifle usually comes chambered for either the military cartridge 5.56×45mm or the .223 Remington. Because of the pressures associated with the 5.56×45mm, it is not advisable to fire 5.56×45mm rounds in an AR-15 marked as .223 Remington, since this can result in damage to the rifle or injury to the shooter. [ 1 ]

  4. Springfield Armory SAINT - Wikipedia

    en.wikipedia.org/wiki/Springfield_Armory_SAINT

    The initial SAINT offering was an AR-15 style rifle with a 16-inch (410 mm) barrel and chambered in 5.56 NATO, introduced in November 2016. [5] It was subsequently named the 2017 tactical gun of the year by American Rifleman magazine. [6] In November 2017, a pistol version including a forearm brace was introduced. [7]

  5. Colt AR-15 - Wikipedia

    en.wikipedia.org/wiki/Colt_AR-15

    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.

  6. Ruger SR-556 - Wikipedia

    en.wikipedia.org/wiki/Ruger_SR-556

    The SR-556 is a semi-automatic AR-15 style rifle manufactured by Sturm, Ruger & Co. The rifle was introduced in 2009 in .223 Remington/5.56×45mm NATO and as a .308 Winchester AR-10 variant in 2013, the SR-762. [4] It is one of several AR-15 rifles to use a gas piston operation.

  7. ArmaLite AR-15 - Wikipedia

    en.wikipedia.org/wiki/Armalite_AR-15

    In the meantime, the Army would continue testing the AR-15, finding that the intermediate cartridge .223 (5.56 mm) rifle is much easier to shoot than the standard 7.62×51mm NATO M14 rifle. [ 43 ] [ 44 ] In 1961 marksmanship testing, the U.S. Army found that 43% of AR-15 shooters achieved Expert, while only 22% of M14 rifle shooters did so.

  8. Ruger AR-556 - Wikipedia

    en.wikipedia.org/wiki/Ruger_AR-556

    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.

  9. ArmaLite - Wikipedia

    en.wikipedia.org/wiki/ArmaLite

    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.