After the war, the bayonet lug was extra to numerous M1 carbines in the arsenal refurbishing process. By the beginning of the Korean War, the bayonet lug-Outfitted M1 was standard issue. It is now uncommon to find an first M1 carbine with no bayonet lug. The M1 carbine mounts the M4 bayonet, which was determined by the earlier M3 combating knife an