Designed by John Browning in 1904, the .45 ACP is an effective combat pistol round, combining accuracy and stopping power. Used in the prototype Colt .45 pistol, the .45 ACP round was used by the US Army in 1911. Where the ACP stands for Automatic Colt Pistol, the .45 ACP is known for having low muzzle flash and blast and moderate recoil. The Armory stocks a wide range of 45 ammo to satisfy the needs of plinkers, hunters, competitive shooters, and the avid ammunition aficionado. Being avid shooters ourselves, we enjoy trying out new 45 ACP ammo and try to offer you 45 ammo at very aggressive prices so that you can share in our most favorite pastime.