NcSTAR VMARTMLM M-lok Triangle Rail System Mid LengthEasy Drop In install, no special gunsmithing involved, fit into Delta Ring and front Handguard Cap. Remove factory handguard, drop in the M LOK handguards and use supplied four screws to secure M LOK 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 M LOK slots along each sides and the bottom of the handguard. Includes two Accessory M LOK to