I just acquired a qb79 and the first thing I did was to try to adjust the trigger. I got it down to an acceptable pull and "click" to try out before taking it apart and honing the bearing surfaces. After shooting it about 50 times, I noticed that the settings had changed and the screws seemed to be backing out again. Is this normal? Should I use some kind of thread lock or a locking nut to stop this? What do I need to do?
Thanks, Joe