noun. A mechanical device that loads ordnance into weapons such as tanks and artillery that would otherwise be loaded by a dedicated crew.

noun. A mechanical device that automatically loads storage media (such as tapes or disks) into the device that can read them.

noun. a semi-automatic firearm

noun. a firearm that reloads itself

"Remington's new 105 CTi autoloader is the most innovative new shotgun I've seen in a long time."

firearm  piece  small-arm  

automatic firearm  automatic gun  automatic weapon  semiautomatic firearm