Sure, here’s the revised title using the correct abbreviations: “Thompson T5100D1927A1C .45 ACP 100rd/20rd”

This .45 caliber carbine features a 16 1/2″ finned barrel, compensator, American Walnut stock, and a lightweight aluminum receiver.

Thompson T5100D 1927A-145 ACP Caliber with 16.50″ Barrel, 20+1 Capacity (Stick), 100+1 Capacity (Drum), Blued Metal Finish, American Walnut Stock Wood Grip Right Hand