Caliber: .45ACP - Barrel Length: 16.5 - Overall Length: 41- Magazine Capacity: 50rd Drum and 20rd Stick - Weight: 13 lbs - Slight: Blade front open rear adjustable - Stock: Walnut fixed stock and vertical foregrip - 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 1/2 finned barrel compensator and is available with a blued steel receiver or a lighter weight aluminum receiver. This configuration is our most popular model.