The Geissele super modular rail MK16 delivers unmatched performance for the most demanding shooters. Its installation on your AR-15 upper is facilitated by an updated version of the proven Geissele barrel nut design, ensuring easy setup and superior rigidity. Anti-rotation tabs and set-screws secure the rail in place, even under extreme conditions. Equipped with an M1913 picatinny rail on top and M-LOK slots on every quadrant, the MK16 provides maximum customization for all your accessories. Precision machined from 7000 series aluminum for strength, rigidity and lightness, it features a durable Type-3 hard coat anodized finish. Notably, the 13.5 inches super modular rail MK16 M-LOK, NSN# 1005-01-672-4794, has been adopted by USASOC for the URG-I program (upper receiver group Improved).