Franklin Armory 15 inch FST Handguard Black. The FST features Magpul M-LOK connection points. M-Lok is a lightweight strong attachment method which allows you to either mount M-LOK compatible accessories or standard Picatinny rail segments depending on your personal preference. Free Float and Vented Handguard. Ultra narrow comfortable and easy to grasp midsection. Full Length Picatinny Rail on Top. 6061-T6 Material. Hard Coat Type III Anodized Black. Barrel Nut Included. 1.35 inch Internal Diameter. Specifications for Franklin Armory FST M-LOK Handguard: Manufacturer: Franklin Armory Color: Black Finish: Type III Hardcoat Anodized Fabric/Material: 6061-T6 Aluminum Gun Make: AR Platform Gun Type: Rifle Gun Rail: Picatinny Additional Features: Free Float and Vented Included Accessories: Standard Mount Type: M-LOK Quantity: 1 Package Contents: Franklin Armory FST M-LOK Handguard Franklin Armory 5474-BLK: 15 inch FST M-LOK Handguard Black