Some possible causes to the BTF situation: The range facilities...If you are shooting at a range where you are inside a booth with walls and ceiling, that is a possible source of BTF. Type of shooting stance...there are two main shooting stances that folks use... The isosceles stance. This is with both arms extended directly in front of you and you are directly facing the target. The Weaver or modified Weaver. You are standing at a diagonal angle to the target and both arms are bent. Try each stance and see if it corrects the problem. Ammo....nope. People have fired thousands of different ammo types and it has been shown it has NO effect on BTF. -------------------------- One thing people seem resistant to do is to talk to a gunsmith about the problem and then send it to him for a fix. I guess people are still swallowing the "Glock Perfection" propaganda and think only the factory has the answer. I would give the factory maybe two tries at fixing the problem. Then I would send it to a gunsmith. If the gunsmith fixes it, I would send the bill to Glock and demand they pay it. Good luck with that part.