We put 100 rounds through it and it was great. No cycling problems or anything. It was shooting a little low, but I wasn't expecting it to be perfect right out of the box. I am very pleased with it and had a blast shooting it. Now my AR is all mine and she can quit bugging me about getting her one. If only her Glock 19 will come in so I don't have to hear about that one as well.
Can you expound a little more on what kind of ammo you were running (not that it matters, since I can't find any)? These are on sale at the local store and I'm thinking of grabbing one as a lighter option for my GF to shoot since my current .22 has a heavy barrel and "gets heavy after a few minutes."