History of the M1921/1928/1928A1 Submachine Gun

The M1928A1 submachine gun is one of the most famous, most recognized guns in the world. First designed and made in an era when cheap labor enabled lavish expenditures of time and materials, the M1928A1 was an over-engineered, bulky, heavy gun. The M1928A1 answered a question that had not been asked yet: What kind of gun is needed for mobile troops on a rapidly changing battlefield? For mounted troops? For urban warfare? For paratroops? When World War II came along and "asked" these questions the M1928A1 was the only answer. Auto-Ordnance had still not sold all of the original production run of 1921. It was a beautiful gun. It was reliable. It did not wear out. And it fired the biggest pistol cartridge anyone had - the .45 ACP. But the realities of war overcame this wonderful gun. The M1928A1 took too long to make, and was too expensive to make. Production was simplified, and finally in mid-war the production of the M1928A1 ceased in favor of the M3 Grease gun. To say that the pendulum swung the other way would be an understatement. Later advancements in gun and ammunition design eliminated the need for a submachine gun. The M1928A1 remains one of the unique American icons. In its glory days of W.W.II it provided un-equaled close range firepower to American and Allied troops. It served on through Korea and  Vietnam. Nobody is sorry they carried one. This gun is hugely popular due to its use in Korea and Vietnam, frequent use in gangster and war movies, and due to the
"revival" of interest in World War II.

Features of Phila. Ordnance 80% Machined M1921/M1928/M1928A1 Receivers

Notes on M1921, M1928, M9128A1 80% receiver:

It is not legal to finish this receiver into a machine gun without the proper license. You can make a non-firearm (DEWAT, blank gun). You do not need to be a licensed manufacturer to make a legal type (semi-auto, single shot) firearm for your own use as long as it is not for resale. Many people use this receiver to make a semi-auto using existing spare parts as this receiver, being made from 4130 aircraft quality steel is much stronger and tougher than the semi-auto receivers available elsewhere. Contact ATF for guidelines on the manufacture of legal semi-auto rifles or blank fining devices.