The Agar Gun, if not referred to as a "espresso-mill gun" because of its resemblance to some coffee mill, was invented by Wilson Agar at first in the US Civil War. The weapon showcased mechanized loading employing a hand crank connected to a hopper above the weapon. The weapon highlighted https://machguns.com/product/colt-ar15a2-converted-to-full-auto-sp326814/