The Asian military mags sometimes have too wide a gap between the lips. Test by loading a few rounds and pulling up on the nose of the top round. If you can pull it out, bend the lips in with a pair of needle nose pliers. I have several of these mags, and they work fine after fixing, and don't seem to spread back with use. Even so, I would never use these mags in a critical application, but they are great for range use.
Also, these mags hold 12 rounds of .40S&W and work fine in a Beretta 96.