Light weight, free float, billet aluminum, modular mount AR-15 / M-16 handguard system. The versatile and attractive Viper Rail, gives the shooter a slim line handguard that easily allows a 360 degree grip around the circumference of the body for most hand sizes. The system is has mounting locations on the 90, 180, 270 degree positions for the 8.5 unit, and has mounting at 0 (on the interrupted section), 90, 180, and 270 degree position on both the 12.5 and 14.5 rails. The system mounts to any Military Standard barrel nut, and has two anti-rotation tabs to prevent the rail from rotating. Specification sheets will be available soon. Current rail will not work with a suppressor without interference. Includes X Product's Lifetime Warranty