The Agar Gun, in any other case known as a "coffee-mill gun" on account of its resemblance into a coffee mill, was invented by Wilson Agar at the start of the US Civil War. The weapon featured mechanized loading employing a hand crank connected to a hopper over the weapon. https://machguns.com/product/lot-1447-u-s-auto-ordnance-1928a1-class-iii-nfa-cr-fully-transferable/