NcStar's KeyMod Handguard for the AR15/M4 Platforms features anodized aluminum construction for light weight and durability, and easy drop-in installation with no special gunsmithing. It fits into your rifle's Delta ring and front handguard cap and uses supplied screws to secure KeyMod handguard in place. This octagon-shaped handguard has seven sides of KeyMod slots, and a solid fit, top rail at AR15 receiver height. It includes: two KeyMod to Picatinny accessory rail sections, one short (3 KM slots/ 5 slot Picatinny) and one medium (5 KM slots/ 11 slot Picatinny) Picatinny rail sections. Designed to fit AR15/M4s with Carbine-length gas systems, Mil-Spec barrel nut, Delta ring, and front handguard cap. It has a black anodized finish. This model is 6.5" long. It weighs 7.9 oz. with both accessory rails installed, and 5.9 oz without rails.