Proprietary 100% free-float attachment system that allows infinitely adjustable mounting positions for any Keymod or SquareDrop accessory. Enabling you to create your own mission specific configuration. Offered in 8 inches, 11.2 inches and 13.5 inches lengths. Unique SquareDrop handguard features extended alignment flanges to ensure a repeatable fit eliminating torque or rotational force movement. Innovative turnbuckle mounting design allows users to quickly and easily install and remove rail system. Full length internal ribs offer superior strength and durability. Smooth snag free design eliminates “cheese grater” effect. Assemblies include handguard, barrel nut, turnbuckle and install wrench.