The MK18 is the latest addition to the Geissele super modular rail lineup, designed to interface seamlessly with the Arca-Swiss quick-release system. Based on the MK16 M-LOK super modular rail, it features a slim profile with a small diameter and overall height, ideal for competition shooters. This rail boasts Geissele's proprietary 2.25 inches long barrel nut, ensuring a straight and true platform throughout the entire length of the free-float rail. Precision machined from 7000 series aluminum, the 16.5 inches MK18 is strong, rigid and lightweight. Utilizing Magpul's M-LOK technology at the primary 3 quadrants (left, right and bottom) and the upper 45's, the MK18 offers unparalleled modularity and customization options. Finished with a durable Type 3 hard coat anodized, the MK18 is available in both black and Geissele's DDC finish. Compatible with Mil-Spec AR15 pattern rifles, the Geissele super modular rail MK18 sets a new standard for performance and versatility.