After testing in early 1943, the U.S. Army decided to shorten the M1905 bayonet's blade to . Production of this new bayonet, designated the M1, began at the five remaining manufacturers by April 1943.
In January 1943, following testing, the U.S. Army shortened the M1905 bayonet's blade and named it the M1. Production of this new bayonet began at the five remaining manufacturers in April 1943.