Troy Bravo Battlerail 13 in-BlackTroy Bravo BattleRails feature full length Mil Std Picatinny Rails and a four clamp locking system that mounts to the factory barrel nut. The design allows for enhanced accuracy and reduced heat transfer. Made from hardened aircraft aluminum, stainless steel components, and Mil Spec hardcoat anodizing finish. Feature full length Mil Std Picatinny Rails and a four clamp locking system that mounts to the factory barrel nut Allows for enhanced accuracy