I had big plans to do this last year. I went out and bought a Rem Ti rifle and was all set up to send it to Christensen arms. I had the quote and everything. Then I did something you should never do with a donor action, I shot the rifle.
"well, this ain't gonna happen" Nothing is going to get away from this rifle as long as I do my part. It's a shooter.
I don't think Christensen will sell a barrel outright, but they will barrel your action. I didn't like this at first either until I thought about a little. There's no learning curve for installing one as they have already done thousands.
Really didn't answer your question, but a TTT for ya anyway.
Terry