We just finished a small run of the 12.5 in. blued carbon fiber barrels for the standard Ruger 10/22 platform rifles :
https://dlaskarms.com/product/dlask-arms-barrel-for-10-22-carbon-fiber-various-lengths/
https://dlaskarms.com/product/dlask-arms-barrel-for-10-22-carbon-fiber-various-lengths/