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. – Caliber: .45 ACP – Barrel: 16.5 Finned (with compensator 18) – Weight: 13 lbs. – Length: 41 overall – Sight: Blade front open rear adjustable – Stock: Walnut fixed stock and vertical foregrip – Magazine: One 10 Round Stick Magazine – Warranty: 1 year