Many aftermarket mags are a gamble but the odds are really in your favor. Sometimes you get a lemon, sometimes you get one that is flawless. Keep in mind, if you want a 10 round mag bad enough, you can start with just about any mag that will stay firmly in the gun and work with it if you have any feeding problems. You can put Ruger followers in and better springs. It all depends on if you get a lemon from the go or not. Keep in mind, most mail order places will let you return stuff if it is defective.