I saw one of these last Saturday in action, it too had a stuck cylinder, it is due to powder residue and needs to be kept clean. Unfortunately this one has two chambers that appear to be under sized as bullets can't be seated properly and the owner had to use a knife to cut the bits sticking out off, also the little wire thingy for pushing out the primers has bent already, as they weren't coming out very easily. I would have thought something more in line of a thicker shaft was needed

it had been fired that morning too, so maybe needs a good clean up on a regular basis

the other thing noticed was, two of the chambers don't index properly when the pistol is unloaded, but strange they seem to once loaded