I took it to my smith and showed him the pistol. "Yep, that'd do it," he said. He then took about 10-15 minutes banging at the pin with a punch to get it out. Finally, when it did come out, he discovered that the pin was covered all over in a reddish brown waxy substance. "Cosmoline," he concluded. He knew that I cleaned it before firing it the first time, so he hypothesized that somehow, between the first cleaning and the accident, the cosmoline (or whatever it was, didn't look like cosmoline to me) softened initially, then later reformed around the pin and hardened enough to basically glue the pin in place. When I first brought the pistol home, I removed the pin, sprayed a short spurt of brake cleaner into the channel, shoved a Q-tip in til I could see the cotton out of the hole, twisted it around a bit, and then removed it. The Q-tip, IIRC, came out a very faint brown color, so I assumed it was clean. Guess not. Somehow, I still managed to fire off 50 rounds after that. I've used brake cleaner on cosmo before with great results. Plus, the rest of the gun looked to have very little, if any, cosmoline in it. It strikes me as odd that brake cleaner and a Q-tip weren't sufficent to clean out what was in the firing pin channel. We gave the hammer and sear a cursory inspection, seeing as how the stuck firing pin was obviously the culprit. Both looked untampered with, just normal wear (and not much, at that). My smith then cleaned out the firing pin channel himself, finishing with a big blast of compressed air to get everything out. When he reassembled everything, we could hear the pin rattling loosely in the slide. We also tried to get the slide to go forward by aggressively slapping in a mag a few times, but no dice. Hmm. My Bulgie would go forward about once every five mag changes before I stoned the slide lock a bit. The Russian only did it once, but boy was that one time a doozie. Before the pistol goes up for sale, I'm gonna bring it out to the range again. One round per mag a few times, then two, etc. I'm gonna shoot it just to get it out of my system. Like the guy at the shop said, "Don't let this little bastard beat you." I guess the moral to the story is: When you think it's clean, clean it some more, dummy! Man, what an experience that was.