Mine was doing the exact same thing. I modified the extractor hook and it helped a little. I fitted a square firing pin stop and a 20# recoil spring. It has run like a top with Tripp 9 and 10 round and Metalform mags. It never locked open but now it does. Just thought I would throw that out.

I have one and it is absolutely reliable and hell-a-accurate. It flings empty brass about 10 yards though. It appears that they got rid of their horrible ILS so the trigger is good to go.

I'm game for a Commander sized single stack 10mm. I just cant afford a custom gun in that configuration.