Thompson 1927A-1 Lightweight Deluxe Semi-Auto Aluminum Receiver Polymer Furniture - Shipped with one 20 round stick magazine and one 50 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 Aluminum Alloy. Walnut Grain Polymer Furniture. This .45 caliber carbine features a 16.5 finned barrel with a compensator. - Barrel: 18 Finned O/A .45 ACP - Length O/A: 41 - Material: Aluminum Alloy - Sights: Pinned in Front Blade Fixed Battle Rear - Stock: Walnut Grain Polymer Furniture - Weight: 8.05 lbs (w/o Magazine) - Magazines: 20 Rd Stick (T5P) 50 Rd Drum & 20 Rd Stick (T5P50D) 100 Rd Drum & 20 Rd Stick (T5P100D)