Proof Research 105351 Bolt Action Barrel Blank 264 Win Mag 24" Black Carbon Fiber Finish 416R Stainless Steel Material Blank with Sendero Light Contour for RiflesProof Research's barrels exemplifies relentless pursuit of excellence. Whatever your preference is, you can expect the finest rifle barrel in the industry. The Carbon Fiber barrel features a full profile, match grade 416R stainless steel barrel blanks that are made in Proof's firearms division. The blanks are then turned down to a significantly reduced profile greatly reducing weight. This reduced contour barrel is then wrapped with high strength,