I also run the ar stoner set up and run the steel case ammo, mine deffinately prefers the non varnishes stuff. Like Carjunkie stated with reloads my group size shrinks in half. I have had to adjust the mag lips to get mine to feed reliably on every brand mag. I free floated my barrel and upgraded my trigger. The trigger makes a big difference. Over all, my ar in this caliber is my most fun gun to shoot of any of my guns.