I just got done cleaning my GP-100 (stainless). It was a follow-up cleanig after cleaning it a week ago. I used shooters choice last week. This week I used Kleen Bore lead removing cloth, some Gun Scrub, and then oiled it down with Miltec. When I went to close the cylinder, it wouldn't close. I tried a few more times and it finally closed. Then the cylinder would bind up while I was dry-firing trying to figure out what was going on (yes, it was in a safe direction, yes, ammo was in a clear container). After a couple of minutes, it just stopped being a problem. Did my metal expand or something? What the heck was that about?