Presma Super Light Slim Free Float No Timing M-LOK Handguards 19.5in AR-15 223/5.56. Black. 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 and hex wrench. 223/5.56 length 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. I.D. Interior wall to wall I.D. is 1.36in. Specifications for Presma AR-15 Super Light Slim Free Float M-LOK 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 Slim Free Float M-LOK Handguards w/ Partial Top Rail Screws Allen wrench Presma MMARB195: Super Light Slim Free Float No Timing M-LOK Handguards 19.5in AR-15 223/5.56. Black