M2 Hyde

The Hyde-Inland M2, officially the U.S. Submachine gun, Caliber .45, M2, was an American submachine gun built from George Hyde's design, patented in 1935, and submitted for trials at Aberdeen Proving Ground in February 1941. General Motors Inland Manufacturing Division developed the prototypes, and in trials the design beat the M1 submachine gun in mud and dirt tests and was more accurate on full automatic than any other submachine gun tested at the time. It is a simple blowback weapon chambered in .45 ACP, fed from the same 20 or 30 round magazines as the Thompson and cycling at about 570 rounds per minute. It was named a substitute standard for the M1 Thompson in April 1942 and Marlin Firearms took over production in 1943, but output fell short of the prototypes and the contract for 164,450 guns was cancelled when the simpler stamped M3 was adopted. About 400 were made, and none was issued to any branch of the United States military.