M7 grenade launcher
The M7 grenade launcher , formally rifle grenade launcher , M7 , was a 22 mm rifle grenade launcher attachment for the M1 Garand rifle that saw widespread use throughout World War II and the Korean War . 
<triplet> M7 grenade launcher <subj> World War II <obj> conflict <triplet> M1 Garand <subj> World War II <obj> conflict <subj> Korean War <obj> conflict