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  2. Springfield Armory M1A - Wikipedia

    en.wikipedia.org/wiki/Springfield_Armory_M1A

    Springfield Armory M1A. National Match front blade, match-grade hooded aperture with one-half minute adj. for windage and elevation. The Springfield Armory M1A is a semi-automatic rifle made by Springfield Armory, Inc., beginning in 1971, based on the M14 rifle, for the civilian and law enforcement markets in the United States. "M1A" is a ...

  3. List of AR platform cartridges - Wikipedia

    en.wikipedia.org/wiki/List_of_AR_platform_cartridges

    The rebated rim dimensions exactly match the 6.8mm Remington SPC case, allowing the use of the 6.8mm SPC bolt-face of an AR-15, but the case has a base diameter of .4400" and cannot be reformed from any other existing case. The 400 LGND uses .4005" jacketed rifle bullets. 450 Bushmaster, Uses .284 Winchester cases. Cut the length to 1.700" to ...

  4. M16 rifle - Wikipedia

    en.wikipedia.org/wiki/M16_rifle

    M16 internal piston action system. The M16 is a lightweight, 5.56 mm, air-cooled, gas-operated, magazine -fed assault rifle, with a rotating bolt. The M16's receivers are made of 7075 aluminum alloy, its barrel, bolt, and bolt carrier of steel, and its handguards, pistol grip, and buttstock of plastics.

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  6. List of Colt AR-15 and M16 rifle variants - Wikipedia

    en.wikipedia.org/wiki/List_of_Colt_AR-15_and_M16...

    1973 Colt AR-15 SP1 rifle with "slab side" lower receiver (lacking raised boss around magazine release button) and original Colt 20-round magazine. M16A1 rifle with forward assist, raised boss around magazine release button and a 30-round magazine. This article describes the many variations of the Colt AR-15 and M16 rifle family of weapons ...

  7. .45 Auto Rim - Wikipedia

    en.wikipedia.org/wiki/.45_Auto_Rim

    The .45 Auto Rim, also known as 11.5x23mmR, is a rimmed cartridge specifically designed to be fired in revolvers originally chambered for the .45 ACP cartridge. The Peters Cartridge Company developed the cartridge in 1920 for use in the M1917 revolver , large numbers of which had become available as surplus following the end of World War I. [ 3 ]

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  9. Match grade - Wikipedia

    en.wikipedia.org/wiki/Match_grade

    In firearms, the term is used to refer to ammunition and gun parts that are designed and manufactured in such a way that they have a relatively narrow tolerance and high level of accuracy. No standards are defined for its qualification and as such it is more of a relative term. [1] In addition to its use in shooting sports, match grade ...