Navy Arms had an absolutely beautiful reproduction Gatling gun on display.
Gatling made numerous different models, in various calibres.
This one is a fairly compact one called the Bulldog model.
It is in 45-70 Government chambering.
They also had a repro Gardner gun as well.
Both the Gatling and Gardner designs are hand cranked (as opposed to modern true full auto that harnesses the energy of the fired round to cycle the action), but they are completely different designs. The Gatling barrels rotate in unison, while the Gardner barrels are stationary, with the bolt mechanism moving back and forth to load and extract.
In the US, these guns are NOT considered full auto, as they do not cycle on their own. Not sure about Canadian law, but at ~$35,000 for the Gatling (I didnt get a price on the Gardner), I wont be getting one whatever the case!