I've never used them on anything except 1911s. I have used those enough to know they flatten out and/or disintregrate after 300 - 1000 rounds. When they do, they will lock the gun up more times than not. My advice is, never put them in a gun for carry. They are fine for the range or general plinking, but do not belong in a duty or carry gun that you want to bet your life on. Justmy $0.02 worth.