Troy's Bravo rail is a one-piece free-floating quad rail design mounts to the existing barrel nut and utilizes a four-clamp locking system enhancing accuracy and reducing heat transfer. This easy to install, one-piece free-float hand guard offers unlimited mounting solutions with four full-length true U.S. MIL-SPEC 1913 Picatinny rails. It is machined from hardened aircraft aluminum with stainless steel components and finished in Mil-Spec Type III hard coat anodizing.