The AAC SquareDrop Handguard is a 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", 11.2" and 13.5" lengths, the 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 Mfg: Advanced Armament SPECS: Length: 8", 11.2" (11.15") or 13.5" (13.51"),Outer Diameter: 1.75",Inner Diameter: 1.30",Weight: 6.35 oz, 9.0 oz, 10.45 oz,Free Float: Yes,Material: Aluminum,Finish: Black Anodizing,Special AAC engraving.