sounds like a nice gun, good info above, and the gap is better if closer but not too close that it "rubs", are there any marks on the face of the cylinder??? if too close and you get any amount of fouling or lead build up, it can start to rub, even get tight , jam things up...a gap of say .004-.006 " is ideal, have seen more, seen them rubbing also............easy enough to properly adjust the head space/cyl gap......
are the cylinders marked in any way with the "last" 3 digits of the guns serial number??? this tells you those are the proper cylinders for that particular gun......