If you want consistency, accurate tightening the guard screws will be a start. Many years ago I had issues with two rifles, a Remington M7 and a Winchester Featherweight. I called both companies for guidance on torque values. I don't know that the information I was given was a considered opinion of the support tech with whom I spoke, or an official suggestion of each company. Winchester suggested 45 in/lbs for the front screw and 8 in/lbs for the rear. Remington suggested 35 in/lbs for the front, and "tight enough to keep it in" for the rear. I wanted to be sure so as a general rule for me on either wood or composite stocks, I have used 55 in/lbs front and 12 in/lbs rear. They stay at that.
