The M60 was a long-barreled, semi-automatic carbine model designed primarily for military training and police use. However, few of these were ever sold. Although mechanically near-identical to the submachine variants, the concept was borne out from H&R's ill-fated .30 carbine light rifle prototype that was trialed against the M1 carbine. The Marines used M60s for training, guard duty, and other non-combat roles. Some M60s were believed to have been issued to Marine officers at Guadalcanal. The remaining guns were passed on to State Guards and civilian law enforcement agencies. The M65 was developed as a sub-caliber training rifle version of the M60, produced only from 1944 to 1946. H&R later made updates to the M65 and sold them on the civilian market (and to the Marines in small numbers) as the MC-58 and M150/151/165 Leatherneck.