Action: Semi-Auto – Caliber: .45 ACP – Capacity: 20rd & 50rd – Barrel: 16.5 Finned Blued – Sights: Open Adjustable Rear Blade Front – Receiver: Steel Blued – Stock: Walnut Fixed – Grip: Walnut – Forend: Walnut – Length: 41 – Weight: 13 lbs. – Includes (1) 20rd stick magazine and (1) 50rd drum magazine – All the classic details of the time honored original are reproduced in today’s semi-auto Thompson. The frame and receiver are machined from solid steel or aluminum. The wood is genuine American walnut. This .45 caliber carbine features a 16.5 finned barrel compensator and is available with a blued steel receiver or a lighter weight aluminum receiver. This configuration is our most popular model.