Manufactured by Auto-Ordnance on contract from the United States Government, the Thompson 1928A1 is one of the signature American weapons of World War II, being deployed in every theater of the war, both in American hands and among numerous Allied units via equipment sharing and Lend-Lease supplies. The 1928A1 is still very close in overall fit and features to the original Roaring 20s/Great Depression "Chicago Typewriter" of gang warfare fame, retaining a number of options that would be eliminated from later production to lower cost and speed production. A number are believed to have been released to civilian and law enforcement buyers, having been left over after the military transitioned to the simplified M1 pattern Thompson. A blade front sight is installed on the Cutts compensator, with a Lyman folding ladder rear sight on the receiver. The barrel retains the cooling fins, with a military pattern straight handgrip. Commercial standard markings are present on the top and sides of the receiver, with the "US MODEL 1928A1" marking on the left side of the receiver along with "RLB", "GEG" and "flaming bomb" inspection marks. The trigger group is unnumbered, with "FULL AUTO"/"SINGLE" selector lever and "FIRE"/"SAFE" safety lever, a grooved pistol grip, and a quick detach buttstock with trapdoor buttplate and a tan canvas "Nobuckl" sling. The bolt assembly is blued, with the lugs removed from the Blish lock; this was a transitional step in the U.S. Thompson's evolution, and the lock would be eliminated entirely in later contract SMGs. A "U" marked Auto-Ordnance "L" type 50-round drum magazine is included.