If the tube became stuck as a result of rust, it is most likely that removing it required some considerable pressure and possible that the rust and force ever so slightly changed the tube enough to let gas behind. It may also be possible that the tube had been dropped at some time slightly damaging the sealing wall. It is recommemded by all choke tube manufacturers that if a tube is damaged in any way buy a new one and destroy the old tube, I suspect that this is what happened, next time let the moths out of your bill fold, it's much cheaper than a new set of Perazzi barrells. I have seen tghis happen before and the owner had been playing around with the gun, if i remember correctly the choke was origionally frozen in. he had the bottom barrell shortened and fitted an extended choke tude
Hotrack
