Thompson 1927A1C .45 ACP Rifle, 16.5-Inch, Used The Thompson 1927A1C is a used .45 ACP rifle with a 16.5-inch barrel. The stated magazine configuration is a 30-round magazine. Used condition is retained as a defining part of this firearm's identity. The magazine capacity identifies the stated round count; it is separate from the barrel measurement. Key Features Configuration: Thompson 1927A1C Rifle. Barrel length: 16.5 inches. Magazine arrangement: 30-round magazine. Specifications Model: Thompson 1927A1C Type: Rifle Chambering: .45 ACP Barrel: 16.5 inches Condition: Used Magazine configuration: 30-round magazine Shop the Thompson 1927A1C .45 ACP Rifle, 16.5-Inch, Used at BattleHawk Armory.