the Colt revolving long gun was the best possible weapon

Major drawback to the Colt Root Revolving Rifle was that it had no useable forearm grip-

Placing your hand forward of the cylinder gap could be detrimental to hand, wrist and arm when it functioned properly. When there were multiple discharges- not all that uncommon with percussion cylinders-
the shooter could end up with the nickname "Stubby".

One of those firearms that killed (or maimed) at both ends.