Had this same exact problem recently with a new Combat Elite (even after more than 500 rounds). Happened with several types of mags, but mostly with some McCormick eight round mags. Got several suggestions about the gun including trying a new slide stop or mags. Went with the advice of purchasing some Tripp research 7 round kits for my McCormick mags. While I was at it, I bought one of their 8 rounders too. With very little range time through the new set up it appears to have cured the problem. Will shoot more to confirm. Hope this helps.
Last edited by jstrange; 04-14-11 at 20:18