The Geissele super modular rail MK16 delivers exceptional performance for the most demanding shooters. It attaches to your AR-15 upper using the enhanced Geissele barrel nut design, ensuring easy installation and superior rigidity. With anti-rotation tabs and set-screws, this rail stays securely in place, even under extreme conditions. Featuring an M1913 picatinny rail on top and M-LOK slots on every quadrant, the MK16 offers maximum customization for all your accessories. Precision machined from 7000 series aluminum, it is strong, rigid, lightweight and finished with a durable Type-3 hard coat anodized coating. Available in 9.3, 10.5 and 15 inches lengths, the 13.5 inches super modular rail (SMR) MK16 M-LOK, NSN# 1005-01-672-4797, is part of the USASOC URG-I program (upper receiver group Improved).