Once the war, the bayonet lug was added to lots of M1 carbines throughout the arsenal refurbishing method. By the beginning of the Korean War, the bayonet lug-equipped M1 was standard challenge. It is now exceptional to find an original M1 carbine with no bayonet lug. The M1 carbine mounts the M4 bayonet, which was depending on the earlier M3 comba