AR-15 pattern pistol caliber carbine in .45 ACP. The K45 completed Olympic Arms' pistol-caliber carbine lineup, adding the classic .45 ACP to their 9mm, 10mm, and .40 S&W offerings. Used a dedicated .45 ACP lower with a blowback bolt. Type: Rifle Action: Semi-Automatic Caliber: .45 ACP Capacity: 20 Year introduced: 1997, United States Weight: 80 oz Overall length: 32.5" Status: Discontinued Intended use: Recreational Shooting, Home Defense