After some chambering issues with CCI Mini-Mags, she smoothed out nicely. 100rd of CCI, then 100 of Winchester Super-X. After the first few, everything ran fine. There were some CCI misfires, but all except 1 fired upon restrike. NO failures to extract or eject. My main issue is with the rear sight. Even with the peep all the way to the left, I was still hitting to the right at 25 yd. If I moved the sight all the way to the front of the rail, it seemed to center. At 25 yd, my groups fired offhand in indoor lighting (with a blurry front sight :-[ ) were 4-6 in. That was me, not the rifle. As far as elevation, I need to find my M16A2 sight tool to get it dialed in. I'll call K-T on Monday to find out what can be done about the rear sight and rail. After sighting in as well as I could, I just ran ammo through her to settle her in. By using my off-hand thumb and forefinger to guide the rounds, I was able to load the mag pretty easily. Despite the issues, she's a keeper.