Thompson 1927A-1 "Deluxe Semi-Auto" with 10 round drum magazine. 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 model.