The Rock Island Armory 51679 GI Standard .45 ACP is a philippines-made single-action pistol chambered in .45 ACP, introduced in 2001. Primary use: sport, hunting. Type: Pistol Action: Single-Action Caliber: .45 ACP Capacity: 7 Year introduced: 2001, Philippines Weight: 30 oz Overall length: 8.5" Status: Active Intended use: sport, hunting