Thompson M1 Features Here is a .45 caliber semi-automatic version of the world s first and most famous military rifle. The Thompson M1 was used victoriously in battles throughout the world inscribing its place for all times as a legend among military firearms. We offer the same attention to craftsmanship today that made the original so highly regarded. The look and feel are authentic right down to the side bolt action. The frame and receiver are milled from solid steel or aluminum the wood is genuine American walnut and the overall finish is a blued steel or black anodized aluminum. Thompson M1 Specifications Caliber: .45 ACP Barrel: 16.5 Smooth Weight: 11.5 lbs. Length: 38 overall Sight: Blade front fixed battle rear Stock: Walnut fixed stock and vertical foregrip Magazine: One 10 Round Stick Magazine Warranty: 1 year