T1/T5, all the classic details of the time honored original are reproducedin today's semi-auto Thompson. The frame and receiver are machined fromsolid steel. The wood is genuine American walnut. This .45 caliber carbinefeatures a 16 1/2" finned barrel, compensator and is available with a bluedsteel receiver. T1-C, the semi-auto "Commando", features parkerized metaland all wood stock, rear grip and horizontal forend in a durable blackfinish.