If I get a gatling gun I want it to shoot .45/70 and have my windsheild lay flat so I can crank it with my hand.
Once I had a BB submachine gun, that ran on either R-12 or compressed air. That ended up somewhere it shouldn't have, and ran off a BBQ bottle re fit to hold compressed air and a old car AC compressor filled that air can, with a varried aray of wiring, relays and solenoids.
At the time I was fairly well amused with myself, but I ain't gettin' into any details. The one detail I will say is that thing held 3,000 BB's at one filling. The 2nd thing I will say is you didn't need sites, you just followed the golden stream
It was a great toy, but I was a little too creative with it.