I have a Norinco 213 (9mm Lugar)which is visually in very good shape. The problem is in the firing, after 6 or 7 rounds the casing doesn't eject completely and jams the slide partly open to the point where I have to return home from the range to free it up.( I have only fired two magazines, different ones, through it and then same thing happened, at the same point, with both) Holding the extractor back with a small screwdriver and tapping the slide with a non-marring hammer (a circus act if you ever saw it happen) is the only way I can free it up. Does anyone have any ideas what can be done to solve this. The casing gets gets stuck in the chamber, whether it is partially ejected and jambed back in or doesn't eject at all I can't tell. The chamber and barrel are clean and polished and snap-caps cycle perfectly every time the slide is run with them. Any one have any ideas??? The pistol is ultra-sonicly cleaned and lubricated and quality gun oil was used. I also have a TT-33C (7.62 x 25) that functions perfectly, are there any parts I can swap just to determine what's wrong?