After telling a buddy of mine how great Larue barrels are, he decided to pick up a 7.62 PredatOBR barrel for his build. He called Larue to confirm that it would work with his DPMS patterned upper. The Larue folks mentioned that he was going to have to use heat to get the gas block off, but otherwise seemed to give him the green light. After milling out his 80% lower and accumulating the other parts needed to build the rifle, he put it together. The problem is that the bolt in his DPMS patterned BCG will not lock up properly with the Larue OBR barrel extension. He called Larue to determine if the PredatOBR barrel extension was compatible with a DPMS bolt and they didn't know. I guess 7.62/308 AR platform weapons don't really have the same military specifications that AR-15 rifles do. So, my question to the worthy Larue community is, has anyone found a bolt or bolt carrier group that works with the PredatOBR/OBR barrels?