Presma M-LOK Free Float Handguard w/Partial Top Rail 10 in Black. Comes with 1 Steel Barrel Nut timing shims. CNC machined from Quality aluminum and black anodized. Super light weight only 11.8oz with barrel nut A true free float rail which connects only at the Steel barrel nut. Since the rail doesn't 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. Barrel Nut requires a Regular Crows Foot type of Wrench or Wrench Head 35mm not included. Specs: 10" Long 1.6" wide 2" tall. Weighs 11.8oz. I.D. 1.555". Note: Requires Low Profile Gas Block and removal of A2 front sight post (if fitted) Includes steel barrel nut screws and hex wrench. Barrel Nut requires a Regular Crows Foot type of Wrench or Wrench Head 35mm not included. Specifications for Presma M-LOK Free Float Handguard w/Partial Top Rail: Manufacturer: Presma Color: Black Gun Make: AR Platform Condition: New Package Contents: Presma M-LOK Free Float Handguard w/Partial Top Rail Barrel nut fixing hardware Presma UMM38D10-H: M-LOK Free Float Handguard w/Partial Top Rail 10 in Black