Well I called Irunguns about my .223 PAR only cycling PMC bronze and not any of the others I tried, he told me that he would call me back later in the day. He calls me back after talking to someone at Troy, and it turns out that the PAR does not function very well with Federal ammo and only use ammo that works in my rifle, which as far as I know is only PMC bronze. He also told me he could do a RMA back to Troy but they would test fire PMC in it and if it functioned properly they would just send it back to me. So I was pretty much told that I would have to live with it and only use PMC bronze which sucks. Also they couldn't do anything about the QD mounts that are out of spec. Not much of a warranty if you ask me. I think I'm going to source a new barrel from Dlask, they might have some left over barrels from the pump action AR's they made several years ago.