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.45 Auto vs .45 ACP

Discussion in 'Caliber Corner' started by TheBigCroaker, Jun 29, 2011.

  1. TheBigCroaker


    Oct 15, 2010
    Being new to 45's, could someone tell me what the difference is (if any) between ammo marked ".45 Auto" and that marked ".45 ACP."
    Are they identical? Can either be used in a Glock 21.
    I would definitive answers, not opinions, please
    Thank You.

  2. .45 ACP , ACP=Automatic Colt Pistol Same thing as .45 Auto.

    Just don't get .45 GAP or .45 Colt they are different things.