The Savage-Stevens Co. of Chicopee Falls, Massachusetts, made approximately 1.25 million No. 4 Mk. II bayonets during 1941 and 1942. These were provided to Britain under the Lend-Lease Act. Savage-made bayonets are much cruder forgings than those made by either Singer or Long Branch.

The U.S. M5 scabbard was made by Beckwith Manufacturing Co. of Dover, New Hampshire. Popularly known as the "Victory Plastics" scabbard, it was unique in design compared to all other No. 4 bayonet scabbards in having an integral web belt frog. These were supplied to the British under the Lend-Lease Act.