Once the war, the bayonet lug was extra to a lot of M1 carbines in the arsenal refurbishing process. By the start of the Korean War, the bayonet lug-equipped M1 was standard difficulty. It is currently rare to find an initial M1 carbine with no bayonet lug. The M1 carbine mounts the M4 bayonet, which was determined by the earlier M3 preventing knif