Fortis Manufacturing, Inc., Rev II, 12.4" Free Float Handguard, Mlok, Fits AR-15, Black WARNING: This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov Material: Aircraft Grade 6061-T6 Aluminum Finish: Military Specification Type III Hard Coat Anodized Inside Diameter: 1.340" Continuous Top Rail Rotation Limited QD Sockets MLOK at the 3, 6, & 9 o'clock Anti-Rotation Tabs Uses Standard AR15 Barrel Nut (Not Included) Made in the USA! 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. Does Not Include Barrel Nut.