The American Defense AD-509T QD Mount (brand part no. AD-509T-11-STD) was developed specifically for the Holosun 509T red dot, giving AR pistols and other weight-conscious platforms a small, light mounting solution built around that optic’s footprint. American Defense Mfg machines the mount as a one-piece unit from 6061 T6 aluminum and finishes it in a hard coat T3 Mil-Spec anodize for real durability. The Patented QD Auto Lock Lever system locks down tight on both in-spec and out-of-spec rail systems, and this Lower 1/3 co-witness height keeps the dot in line with your iron sights.

Key Specifications

• Developed specifically for the Holosun 509T red dot.
• Machined as a one-piece unit from 6061 T6 aluminum.
• Finished in hard coat T3 Mil-Spec anodize for durability.
• Uses the Patented QD Auto Lock Lever system for a secure, repeatable mount.
• Accommodates both in-spec and out-of-spec rail systems.
• Built in the Lower 1/3 co-witness height configuration.

Frequently Asked Questions

What optic is this mount built for? It was developed specifically for the Holosun 509T red dot.

Will this mount work on an out-of-spec rail? Yes, the Patented QD Auto Lock Lever accommodates both in-spec and out-of-spec rail systems.

Buy the American Defense AD-509T QD Mount for Holosun 509T, Lower 1/3

A purpose-built mount beats a generic one every time, and this American Defense AD-509T is machined specifically for the 509T. Order it from our Lubbock, Texas gun shop for fast, direct shipping and add a secure red dot mount to your build.