For more information about this weapon in Mud and Blood 2, see M1 Carbine.
The M1 Carbine is a light semi-automatic rifle which sports a low bulk and recoil value, at the cost of low damage, range, and free ammunition. It is one of the basic starter weapons, along with the M16 and Model 77E.
This weapon's inclusion despite the M1 Garand's exclusion can be attributed to the presence of the M14 being the M1 Garand's successor. Lacking a carbine option, the M1 Carbine was remained despite not seeing much front line usage.