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 Olympic Arms K45M AR-15 45 Automatic Colt Pistol (ACP) 17 rd Black Finish   This polymer magazine is designed to work specifically with Olympic Arms' pistol caliber upper receivers and AR-15 lower receivers. The feed ramp in the pistol caliber upper receivers has changed slightly over the years and the magazine may not work in all upper receivers without minor modification. his model is for 45 ACP and has a 17-round capacity.

 Caliber             :45 Automatic Colt Pistol (ACP) Capacity            :17 rd Finish              :Black Model               :AR-15