Need Help With Cycling Issue - Proof Barrel

[donno]

A couple of things I have found since building an ARC. Forget what you've learned from building 223/556 rifles. 6 ARC seems to take a lot of gas. A lot more than I thought. I was having "short stroking" issues. Fixed that and now have "bolt bounce" causing the bolt to hit and back up a thousand or two. I think the fix will be a heavier buffer and flat spring and also a full mass BCG.