My experience as well in two Rugers, a Sig, a Remington-Rand 1911a1, and an even half dozen Colts over the years. Finally gave up on the idea...took awhile. They sound like a good idea, but if you're shooting the gun correctly sprung & as it was designed for bullet weight and velocity, their not needed. Rod"I agree with Char-Gar, fine for a range pistol but not something for a pistol on which you stake your life. My personal experience with them is they will eventually tie up the gun."