Guys I have a used Proof 6MM Creedmoor barrel for sale. It has just over 600rds on it. I just don't shoot the 6MMs any more. I have moved on to the 6.5s and 7MMs. The barrel is SS 22" pretty much the same size as the RPR barrels. I had a smith look at the barrel and check it for fire cracking. He said there was no fire cracking and the throat is just starting to show a touch of wear. I never got it hot and only shot steel with it. If someone is interested in giving it a new home I would take $300 shipped to you. Thanks guys!!!