These are the best rails on the market! They are strong, lightweight, and made by one of the best companies in the game! This rail is 15 inches and has MLOK slots all around. The lockup system is super solid and the rail comes with a QD M-LOK adapter that you can install if you wish. All mounting hardware is included, including the barrel nut wrench.

Bravo Company 15″ MLOK Compatible Modular Rail (MCMR), For AR Rifles, Black BCM-MCMR-15-556-BLK

BCM® MCMR-15 (M-LOK® Compatible* Modular Rail)
Featuring the same industry leading barrel nut and lock up design as originally introduced on BCM’s evolutionary KMR handguard, the MCMR Series of handguards gives the shooter modularity in the M-LOK platform.

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.

• 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 alone weighs 9.2 oz
• 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

Actual length when measured to flare is 15.0″

Designed to be used with pistol length, carbine length, mid length, or Mil-Spec M16 rifle length gas systems; all with a low profile gas block.

The barrel nut will fit over all mil-spec diameter barrels (max of 1″)

Bravo Company MFG, Inc. US Patent 8904691