Proudly made in the USA, this M-LOKA(R) MSR15 Super Slim Free Float Handguard is compatible with the standard Mil-spec AR15 upper receiver and utilizes the UTGPro proprietary barrel nut allowing easy installation. The integral anti-rotation tabs for accurate alignment with the upper receiver while completely preventing the handguard from rotating under heavy use. Designed to Fit with Standard Gas Tube and Barrel Diameter Not Exceeding 1" Not