The American Defense Mfg Holosun 509T QD Mount, Co-Witness (American Defense part no. AD-509T-10-STD) was developed specifically for the Holosun 509T red dot on AR pistols and other weapon platforms that call for a small, lightweight red dot system. Machined as a one-piece unit from 6061 T6 aluminum and finished in hard coat T3 Mil-Spec anodize, it’s built to hold zero under recoil on a duty or competition rifle. The Patented QD Auto Lock Lever accommodates both in-spec and out-of-spec rail systems, so it locks down tight on a wide range of Picatinny rails. This co-witness height positions the 509T’s dot in line with standard AR iron sights for a fast backup sighting option.

Key Specifications

• Purpose-built for the Holosun 509T red dot sight.
• Machined as a one-piece unit from 6061 T6 aluminum.
• Hard coat T3 Mil-Spec anodize finish resists wear and corrosion.
• Patented QD Auto Lock Lever accommodates both in-spec and out-of-spec Picatinny rails.
• Co-witness height aligns the red dot with standard AR iron sights.

Frequently Asked Questions

What optic is this mount designed for? It’s purpose-built for the Holosun 509T red dot.

Does the co-witness height work with standard AR iron sights? Yes, this co-witness variant aligns the 509T’s dot with standard-height iron sights.

Buy the American Defense Mfg Holosun 509T QD Mount, Co-Witness

Order this QD mount from our Lubbock, Texas gun shop for fast, insured shipping, and browse the rest of our red dot mounts selection to finish your optic setup.