Even just strapping a grenade launcher to a rifle is nothing new – the M203 single-shot grenade launcher attachment for the ...
It will replace the current M203 grenade launcher. In early March, Marine Corps Ground Combat Elements Systems worked with maintenance Marines and logisticians to assess provisioning, sustainment ...
One of the main differences, though, is that it has a longer barrel length. The M203 shoots 40mm grenades and can be fitted under the M4 and M16, but the Army is currently phasing it out for the M320.