All the classic details of the time honored original are reproduced in today's semi-auto Thompson 1927-A1. This .45 caliber carbine features a 16.5" finned barrel and genuine American walnut woodwork. It has a blade front sight with an open rear adjustable sight. This Deluxe Semi-Auto model has a pinned compensator for an 18" barrel length. The frame and receiver are machined from solid steel with a blued metal finish, and a fixed buttstock, pistol grip, and vertical foregrip. It includes a 10-round drum magazine. Oal 41" Hand Right Twist 1:16" Action semi-auto Muzzle Compensator Safety Manual Thumb Series Deluxe Sights Blade Front/Fixed Battle Rear Weight 13 lbs Caliber 45 ACP Capacity 10+1 Weight Range 13 lbs to 13.99 lbs Barrel Length 16.50" Receiver Material Steel Stock Description American Walnut Barrel Description Finned Metal Finish Group Blued/Black Stock Finish Group Brown Barrel Length Range 16" to 16.99"