I have a non-restricted CSA 5.56 (that's what it says does anyone know if that's a true 5.56 or if it's a .223/5.56 please pm me.) I bought it a while ago with 40 rounds of winchester .223 ammo and 39 rounds fired without a hiccup so says my brother who stole my gun and ammo, the other 1 didn't fire but had a noticeable defect on the case. I'm assuming that was a factory dud. I bought the norinco 1120 round deal and am planning on putting my first round through my gun soon. Ohh well I steal my brothers toys all the time.