My son's department had a problem with Glock 22 AFTER installing the light kit....Seems kit was a little heavy for that weapon...Lighter kits seemed to correct the problem....Things change all those many years ago they taught not to hold lite directly under barrel as it gave the bad guy (guys) a direct target....????? I hate the Glock look but have always found them to be reliable, never tried one with a light attached, or in a gun fight.....