A couple of alternatives are a clockwork pepperbox and a Gatling pistol. Both would be the same in game terms, except that since the pepperbox has to have it's barrels reloaded individually (as compared to just replacing the magazine on a Gatling), it could only fire every other turn. Both would be powered by a wound spring (a hand crank would be awkward, I think).
Possible stats: SV Bonus +1, Range 9", Hands 1, Pluck Modifier -1, Cost 6 (pepperbox)/ 7 (Gatling)