Guys I know the title looks a bit perverted.... but here's my situation: I have shot approx 250 rounds through my mini with ZERO jams. Then I did a typical cleaning and lube of the WHOLE gun and now it seems once every 10 - 20 rounds a shell WON'T eject all the way. It ALMOST makes it out but the incoming round pinches it in there. I rack the slide and all is well again. What could I have done to cause this? Is there a seal on the gas block?