The above US M4 bayonet is a high quality copy of the US Model M4 Bayonet for the US M1 Carbine, 30 caliber.
They are marked under the cross-guard, "US M4" and on the pommel Allen screw, "UM 10.9". All metal parts are Parkerized black, and grips are black plastic. Scabbards are black plastic with stamped sheet metal throat, no drag. Throat is stamped, "U.S. M8A1" over, "Made In Germany". Belt attachment canvas in olive drab in color.