NCT-VMARTKMMEasy 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. This model fits: Mid Length Gas Systems. This replaces standard Mid 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