Proof Research 20" 6.5 Grendel Carbon Fiber 1:8 Rifle .875 AR-15 Barrel

Proof Research's Carbon Fiber Barrel manufacturing process begins with full-profile, match-grade 416R stainless steel barrel blanks that are then turned down to a significantly reduced profile greatly reducing weight. This reduced contour barrel is then wrapped with high-strength, aerospace-grade carbon fiber impregnated with a proprietary matrix resin developed by Proof's advanced composites division, PROOF Research ACD.The aerospace-grade carbon fiber used has a specific strength up to 30 times that of stainless steel and a specific stiffness up to 7 times greater than steel. But strength and stiffness are only part of the equation. Heat conductivity and thermal expansion are also of paramount importance when developing a match-grade carbon fiber barrel. Proof's helical wrapping pattern favors the longitudinal thermal diffusivity of the carbon fibers (along the length of the barrel) allowing them to more efficiently dissipate heat emanating from the barrel rather than insulating it.Because Proof's rifle barrels are engineered for thermal performance, they also move heat very effectively through the wall (thickness) of the barrel, greatly increasing heat transport and resulting in barrels that cool faster and maintain accuracy over longer sessions of fire.The end result is an aerospace-grade, high-fiber content composite barrel that is stronger, lighter, as accurate as the finest precision steel barrel, and maintains its accuracy in the most demanding environments.FeaturesUp to 64% lighter than traditional steel barrels of similar contourMatch-grade accuracyImproved heat dissipation for cooler and longer lasting barrelsNo point-of-impact shift during high-volume fireReduced harmonic barrel vibrationUnprecedented durability