Thanks for the pics. Currently I have 3 (1878 10 ga. and 2 1883 12 gauge). I shoot mine with low pressure smokeless loads.
My understanding is, yes.Did all the colt shotguns have imported barrels?
Offhand I think about 3", but not quite sure.I just bought (laway) a 10 gauge 1878 colt with 32in barrels. What are the chambers? I see you have a 10 gauge.