Sorry to hear that you are haivng troouble with the .308 conversion barrel. Give me a call if you want and we can talk about it. One thing to look at is if the ports in the regulator have been enlarged. I've had a number of barrels through here with ports that were drilled out to overcome some problem with the barrel, usually chamber pitting or pitting left over from welding that was removed. I odn't recall your barrel's chamber, but the barrel teste din one of my guns.
Bob
Bob