The Holosun 509T QR Lower 1/3 Mount by American Defense Mfg. is designed for the Holosun 509T red dot sight, making it an ideal choice for AR pistols and various weapon platforms that benefit from a lightweight and compact red dot system. This precision-crafted mount is made from 6061 T6 aluminum and features a hard coat T3 Mil-Spec anodized finish for enhanced durability. Its patented QD Auto Lock Lever system ensures a secure fit on both in-spec and out-of-spec rail systems, while allowing for easy adjustments without proprietary tools. Whether you are adjusting with your finger or a flat blade screwdriver, this mount offers superior clamping to ensure maximum rail engagement, making it a reliable choice for tactical and competitive applications.