Fortis Manufacturing, Inc. Rev II, Handguard, Black, MLOK, Fits AR-15, 9.6 REV-II-9-ML-BLK Fortis REV II is an extremely lightweight yet robust free floating rail system. When designing the REV" Fortis didn't want just another rail system" they wanted a better" lighter" feature rich handguard that was robust and within budget. They've managed to reduce as much weight as possible while maintaining strength by utilizing a 1 piece body design. KeyMods were added at the 3" 6" & 9 o'clock positions for modularity and additional weight savings. Its unique mounting system captures a standard AR15 barrel nut for easy installation. Check out all the features and see for yourself why the Fortis REV beats the competition. It is also piston compatible. Has anti-rotation tabs.