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