Geissele Automatics 051073B: Experience unmatched shooting performance with the Geissele Super Modular Rail MK16. Designed for the most intensive shooters, it can be conveniently affixed to your AR-15 upper using the advanced version of the reliable Geissele Barrel Nut design, making the MK16 easy to install and maintain.Known for its superior rigidity, the MK16 is equipped with anti-rotation tabs and set-screws. These ensure that your rail does not rotate, maintaining stable and reliable performance even under the most extreme conditions.This model is built for versatility, featuring an M1913 picatinny rail on top and M-LOK slots on every quadrant. This design allows for maximum customization with all your accessories. Crafted from 7000 Series Aluminum, known for its robust and lightweight properties, the Geissele SMR MK16 ensures durability and efficiency.Furthermore, the MK16 is finished with a tough Type-3 Hardcoat anodized finish, ensuring longevity, making it a reliable addition to your shooting gear.