the act of striking someone with the buttstock of a rifle, carbine, or
shotgun. This is in contrast to "pistol-whip," which is the act of striking someone with a handgun, while gripping either the handgrip or the
barrel/
slide, but more commonly the latter.
"The
brave Marine, having expended his last
magazine, but
lacking a bayonet, saw fit to buttstroke the charging enemy combatant."