M4 Submachine Gun

The Model Four Caseless Submachine Gun was a submachine gun in service with the UNSC during the early years of the .
==Development==
==Usage==
Although it was phased out of UNSC service before 2500, it is still in service among Insurrectionist forces and other militia, who prefer it for its compact size (19.5 cm in length) and relatively large magazine for its size (35 rounds).