Thank you for all the info. I got it to run in DA, somewhat. The TBS was putting too much up force on the trigger bar. Bending it down some resulted in no DA. By trial and error I got it to run, somewhat. The trigger has a lot of play, side to side so when I use my left hand it works great, right hand , not so much. I will call CZ and order a new trigger, roll pin, TBS, and the mag spring screw, that should take care of the problem. Thanks again or your effort to help, Bob.