Geissele MK16 AR-15 Super Modular Rail - 10.5

The Geissele Super Modular Rail MK16 offers unmatched performance for the most demanding shooters. Mounted to your AR-15 upper using the updated version of the proven Geissele Barrel Nut design, the MK16 is not only easy to install and maintain, but offers superior rigidity. Anti-rotation tabs and set-screws ensure that your rail will not rotate, even under the most extreme conditions of use. M1913 picatinny rail on top and M-LOK(TM) slots on every quadrant ensures maximum customization for all your accessories. The Geissele SMR MK16 is precision machined using 6061-T6 Aluminum due to its strong, rigid and light properties, and is finished in durable Type-3 Hardcoat anodized. Specifications: Height: 2.39" Color: Black or DDC Material: 6061-T6 Finish: Type 3 Hardcoat Anodize Inner Diameter: 1.26" Outer Diameter (DAQ*): 1.59" Weight: 11oz (12.6oz w/ barrel nut) Please Note: Their rails are designed to work with Mil-Spec M4 upper receivers. The compatibility with billet receiver sets is unkn