Purchased a glock 23 from a private party (had all valid paperwork) he installed a ghost trigger and polished the barrel. When I go to shoot a magazine through it, every 2nd or third shot doesn't strike hard enough resulting in a re cock of the slide, also towards the end the trigger stays pulled and it dumps 2-3 rounds of full. I immidiately took the weapon apart and noticed the recoil spring jumps off of the rail on the barrel after every shot. I am not going to put it back together until I figure out what is wrong in order to avoid any trouble with the law. Any help is greatly appriciated. Thanks you very much!