:nutkick I have about 100 of the 223 mags and they seem to work just fine. However, I did have a problem with the 9mm mags. The angle of the mag follower is tilted up towards the front. When the bolt pulls out a spent casing, the tip of the round below it is hitting the casing before the ejector pushes it out causing el grande jam. My original colt mags have level followers. So, I filed down each of my C Product 9mm mags and they work fine. I have a number of the Colt 9mm ARs and this happened in each one. The bodies of the 9mm mags are top notch...at least as good as Colt.