Frank, Please chime in........
I m copying this from a post Mark made on another forum. I thought it would be noteworthy. I believe they purchased Proof recently.

"Bartlein Barrels is proud to introduce their new line of Carbon Fiber wrapped barrels.
We will start off with 3 contours, the #4 Bull Sporter, #13 Rem Varmint, and the #14 M24/M40.
Lengths will be 20", 22", 24" and 26" finished lengths in any twist you like including Gain and Left Hand twists.
And just to make it a little more interesting--4 Colors, Black, Red, Green, and White(black marble).
For more information give us a call at the shop or check out our Facebook page
Later, Mark Buettgen
Bartlein Barrels Inc "