During the Korean War, the M1 bayonet, which mounted to the M1 rifle, was found difficult to remove while wearing heavy gloves.
The stud on the bayonet crossguard fits the gas cylinder lock screw under the M1 Rifle barrel.
The grips are checkered black molded plastic and all metal parts are a dark gray parkerized finish.
Many M5 family bayonets were made in Korea after the Korean War and these will have "K" stamped in place of the "US".
The scabbard throat flange is stamped "US M8" or "US M8A1" on the flat steel part along with manufacturer initials.