Hello all. I have a 6" GP-100 blued, half-lug that I've recently been having a problem with. Before developing this problem, I had been shooting some Armscor ammo, which I admit is a bit on the dirty side, but I've shot some before with little to no ill-effect. Anyways, it seems like the cylinder is having trouble turning, and because of it, makes the trigger pull REALLY heavy and erratic. I thought it was just dirty and so I gave it a cleaning. I scrubbed the bore, chambers, and the cylinder face (both sides), underneath the ejector, etc. Then I lubed it up like I normally would, and while it alleviated the problem somewhat (at one point it was so bad that the cylinder just would not turn), it is still present and is bugging the heck out of me. I don't know what else it could be. I've never had this problem in the past, and if the gun is going to occasionally lock up like this, I will lose all faith in it for any useful purpose. Heck, it is even annoying as a range gun. Anyone have any suggestions? I know with S&W's, the pin holding the cylinder onto the frame can come loose sometimes causing the cylinder to stop turning, but I don't think GP-100's have that problem. Any ideas???