on my x95, I did run into issues with Barnaul steel case fmj lead core ammo with ATRS 10/20 mags because the same ammo was fine with factory and PMAGs. the same ATRS mags work fine with AE 223 ammo. So, not sure what the issue was and I am asking a friend to test the same mags and ammo combo in his AR and X95. The issue was from 2nd round, the ammo won't feed and I had to manually load each round by pulling the bolt handle. ATRS was not aware of the issue, but said they never tested with Barnaul ammo.