#machine_gun__machinegun  a rapidly firing automatic gun (often mounted)
  supertype:  firearm__piece__small-arm__smallarm  a portable gun; "he wore his firearm in a shoulder holster"
  subtype:  automatic_rifle  Browning_machine_gun  Gatling_gun  Maxim_gun  Spandau  submachine_gun
  part:  gunstock__stock  the handle of a handgun or the butt end of a rifle or shotgun or part of the support of a machine gun or artillery gun; "the rifle had been fitted with a special stock"

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