Most of the trouble with the magazines that come about have to do with the springs. When they come in they are in bulk and need to be seperated and if your not careful you can distort them, It does not take much and then the mag hangs up.I have not received too many complaints about them but if i do i make sure to make good on it. I will never let a customer be unhappy, after all if you do not have happy customers then you do not have a business very long.