NcSTAR Keymod Rail System/Mid Length Black 8.5 in Length. Specifications for NcStar Keymod Rail System: Designed to fit AR15/M4s with: MIL-SPEC Barrel Nut Delta Ring and front Handguard Cap. Length: 6.5" Weight: 5.9 oz. / 7.9 oz. with both accessory rails attached Features of NcStar Keymod Rail System: US PATENT PENDING 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 screws to secure KeyMod handguard in place. Solid fit top rail is at receiver height and you have 7 angles of KeyMod slots Black Anodized Aluminum Construction This model fits: Carbine Length Gas Systems Includes two Accessory KeyMod to Picatinny Rail Sections. One Short (3 KM slots/ 5 slot Picatinny) and one Medium Length (5KM slots/ 11 slot Picatinny) Picatinny Rail sections. They can be placed in any of the 7 angled KeyMod Package Contents: NcStar Keymod Rail System Specifications for NcStar Keymod Rail System: Manufacturer: NcSTAR Color: Black Finish: Anodized Fabric/Material: Aluminum Gun Make: AR Platform Gun Model: M4 AR-15 Gun Type: Rifle Gun Rail: Picatinny Condition: New Included Accessories: Short/Medium KeyMod to Picatinny Accessory Rails Mount Type: KeyMod Quantity: 1 Package Contents: NcStar Keymod Rail System The NcStar Keymod Rail System is a quality addition to the NcSTAR lineup. For more great deals on AR Handguards & Forends by NcSTAR please browse our NcSTAR AR15 Accessories page. NcSTAR VMARKMM: Keymod Rail System/Mid Length Black 8.5 in Length