Brian is a great guy.
If you buy an accessory barrel, either through Remington, or from someone here (used), do yourself a favor:
Send it to Brian for Factory Fitting!
He made things right for me, and I have several perfectly fitting barrels with no shims whatsoever. Price is fair and reasonable. And, as has been said, he does it quickly.
Remington is lucky to have him, and so are we!
Thank you Brian!