Tiger Rock AR-15 10" Mid Length Free Float Handguard w/Barrel Nut Black. Each comes with a barrel nut kit and has an extended top rail for "No-gap" installation. CNC precision machined solid 6061-T6 aluminum with a hard anodized matte black finish these quality rails give you lots of accessory options. Each has two QD sling swivel ports and with an inner diameter of 1.835" they can accommodate almost any low-profile gas block on the market. Specifications for Tiger Rock AR-15 Free Float Handguard w/ Barrel Nut: Manufacturer: Tiger Rock Color: Black Finish: Hard Anodized Matte Fabric/Material: 6061-T6 Aluminum Gun Make: AR Platform Gun Model: AR-15 Gun Type: Rifle Handguard Type: Free-Float Handguard Style: Quad Rail Gun Rail: Weaver Picatinny Included Accessories: Standard Inner Diameter: 1.835 in Quantity: 1 Package Contents: Tiger Rock AR-15 Free Float Handguard Barrel Nut Necessary Hardware Tiger Rock FAR10: AR-15 10" Mid Length Free Float Handguard w/Barrel Nut Black