I mean, they even provide the Loctite called for in the installation instructions. This is a very minor complaint though and the torx socket can easily be sourced, as you will already have to do for the torque wrench. As a mechanic, I prefer drivers and keys that are flush, as they don’t allow the key to wobble inside the head of the hardware while torquing. Also, the provided key has a small bump on the tip of the torquing ends. The instructions call for a torque spec, so a torx adapter for a ratchet would make more sense, in my opinion. My only complaint is that the torx key provided for the hardware isn’t the best. Also, huge props for the quality instructions and providing everything you need for install, minus the torque wrench. Set up with the proper gap from the upper, it offers excellent accuracy. Utilizing Magpul’s M-LOK technology at the major 3 quadrants (left, right and bottom), as well as the upper 45’s gives the MK18 unprecedented modularity and ability to be customized. The interference fit allows for exactly ZERO play before you even get the mounting hardware installed. The 16.5 long MK18 is 3D precision machined using 6061-T6 Aluminum due to its strong, rigid and lightweight properties. I have bought several other BCM products previously and each one has been great. *M-LOK® is a registered trademark of Magpul Industries Corp. Aluminum Picatinny rail sections may be torqued to 30 in/lbs. when securing fasteners on Polymer accessories. For load bearing accessories (bipod mounts, sling mounts, vertical grips, barricade supports), we recommend aluminum Picatinny rail sections.

Please note: Nylon/Polymer Picatinny rail sections are for NON-load bearing accessories only (grips, hand stops, light mounts). The barrel nut will fit over all mil-spec diameter barrels (max of 1')īravo Company MFG, Inc. Includes BCM M-LOK Compatible Sling Mount, (FREE for a limited time)Īctual length when measured to flare is 13.4'ĭesigned 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.Hard Coat Anodized per Mil-A-8625F, Type III, Class 2.Steel Barrel Nut (same KMR, MCMR, and QRF series), to resist movement under heat.Proprietary engineered profile offers additional cross sectional strength.Precision Machined Aerospace 6061-T6 Aluminum Alloy, for high strength and lightweight.Free Float Handguard eliminates loads from barrel, reducing the deflection for more accurate shooting.

MCMR features M-LOK Compatible mounting system.

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. BCM® MCMR-13 (M-LOK® Compatible* Modular Rail)įeaturing 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.

Modular ar rails