Easy Drop-In install, no special gunsmithing involved, fit into Delta Ring and front Handguard Cap. Remove factory handguard, drop in the KeyMod handguards and use supplied four screws to secure KeyMod handguard in place. US Patent Pending This model fits: Carbine Length Gas Systems. This replaces standard Carbine and M4 Length handguards. Solid fit, top rail is at receiver height and you have KeyMod slots along each sides and the bottom of the handguard. Includes two Accessory KeyMod to Picatinny Rail Sections. One Short (5 slot Picatinny) and one Medium (11 slot Picatinny) Length Picatinny Rail sections. They can be placed in any of the sides or bottom KeyMod slots. Black Anodized Aluminum Construction Handguard surface overall Length is 8.75". The Handguard extends past the front handguard cap and front sight post, to give you more surface area to place your hand and accessories.