A pistol that will keep firing until the ammunition is gone or the trigger is released(noun)
WordNet. Princeton University. 2010.
Use "automatic pistol" in a sentence
"He was pointing a very large Sig-Sauer automatic pistol at the astonished man."
"Drawing a SIG P225 automatic pistol from beneath his jacket, he took aim at Tyler."
"A PRC automatic pistol was in his hands and he stood at the gunnel silhouetted in the light, the cap pulled well down to preclude identification by the binoculars he knew were raking the ship."