Presma AR-15 Super Light M-LOK Series Free Float Handguards with Partial Top Rail 17in Black. 56 free float rail mount with partial Picatinny Top rail and M-LOK slot system. Steel barrel nut included. CNC machined from Quality aluminum and black anodized. Super light weight. A true free float rail which connects only at the Steel barrel nut. Since the rail doesnt touch the barrel shooting accuracy is improved in comparison with two piece rails when used with grips / bipods that can flex the Steel barrel. Includes steel barrel nut screws (2) shim rings for barrel nut timing (2) 3 slot M-LOK rail segments (2) 7 slot M-LOK rail segments and M-LOK screw set. Specifications for Presma AR-15 Super Light M-LOK Series Free Float Handguards w/ Partial Top Rail: Manufacturer: Presma Color: Black Finish: Anodized Fabric/Material: 6061-T6 Aluminum Gun Make: AR Platform Gun Model: AR-15 Gun Type: Rifle Gun Rail: M-LOK Condition: New Included Accessories: Standard Mount Type: M-LOK Quantity: 1 Package Contents: Presma AR-15 Super Light M-LOK Series Free Float Handguards w/ Partial Top Rail Screws Allen wrench Rail section Presma MARMP17: AR-15 Super Light M-LOK Series Free Float Handguards with Partial Top Rail 17in Black