Bravo Company MFG MCMR M-LOK Compatible Modular Rail 13 inch Steel Barrel Nut/Hardware/Sling Mount Black. This proprietary patented mounting system (US Patent 8904691) includes a mechanical index to the 12:00 rail and positions mounting hardware to mitigate the movement caused by heat generated by the weapon system. Specifications for Bravo Company MFG MCMR M-LOK Compatible Handguard: Manufacturer: Bravo Company MFG Color: Black Finish: MIL-A-8625F Type III Class 2 Hard Coat Anodized Fabric/Material: 6061-T6 Aluminum Gun Make: AR Platform Gun Model: AR-15 Gun Type: Rifle Gun Rail: Picatinny Additional Features: For low profile gas block Included Accessories: BCM-KMR-BNW KMR Barrel Nut Wrench BCM-MCMR-SM QD Sling Mount Handguard Mounting Hardware BCM-KMR-BN Steel KMR Barrel Nut Mount Type: M-LOK Attachment Type: Picatinny Quantity: 1 Features of Bravo Company MFG MCMR M-LOK Compatible Handguard: MCMR features M-LOK Compatible mounting system. Free Float Handguard eliminates loads from barrel reducing the deflection for more accurate shooting. Precision Machined Aerospace 6061-T6 Aluminum Alloy for high strength and lightweight. Proprietary engineered profile offers additional cross sectional strength. Steel Barrel Nut (same KMR MCMR and QRF series) to resist movement under heat. Hard Coat Anodized per Mil-A-8625F Type III Class 2 Handguard mounting hardware 2.3 oz Includes BCM M-LOK Compatible Sling Mount (FREE for a limited time) 1.3" Inside Diameter 1.5" Wide Package Contents: Bravo Company MFG MCMR M-LOK Compatible Handguard Bravo Company MFG BCM-MCMR-13-556-BLK: MCMR M-LOK Compatible Modular Rail 13 inch Steel Barrel Nut/Hardware/Sling Mount Black