hi everyone , new to the forum ,but looking to learn all I can about the pf9. retired LT friend of mine has one and has just sent it back to the "mother Land" for some repairs. Seems that first 100 rounds did well , but after he installed trigger shoe he started to have problems with the hammer not being fully cocked after a round was fired. It would cycle a new round but it would't let the hammer return to it firing position. He said it looked like it was half cocked. Then when he pulled the trigger again the gun doubled fired. Anyone else have this problem?