Fortis Manufacturing, Inc., Rev II, 15.3" Free Float Handguard, M-LOK, 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 Manufacturing's REV II AR-15 M-LOK Handguard 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. Fortis managed to reduce as much weight as possible while maintaining strength by utilizing a 1-piece body design. M-LOK cutouts are added to the 3, 6, and 9 o'clock positions for modularity and additional weight savings. The REV II's unique mounting system attaches to a standard AR-15 barrel nut (not included) for quick and easy installation. The REV II is compatible with both direct impingement and piston operating systems, and features anti-rotation tabs for added stability. Barrel nut not included.