I know this is probably a dangerous question to raise here but I have been really enjoying my custom 260 bolt rifle built on a Proof Research barrel and seriously need a 260 barrel for my tOBR. I know the LT sparrels in 260 will probably be a while so I was thinking a Proof Research carbon barrel might bridge the gap. My question is: is the barrel extension on a Proof barrel compatible with a tOBR upper and BCG. The Proof barrels claim to be 100% DPMS compatible and I know a few people who have built AR10s with this barrel and a JP BCG with good results. Has anyone tried this? Not only do I not want to shell out the cash if it won't work, most importantly, I don't want to harm my tOBR. If it is not compatible, I will probably just build a complete upper that I can put on my tOBR but that kinda defeats the whole reason I bought a tOBR.