AD-509T | Holosun 509T Co-Witness QD Mount

The AD-509T QD mount is designed specifically for the Holosun 509T red dot and for use on AR pistols and other platforms that require a compact, lightweight optic mounting solution. This one-piece unit is precision machined to provide a stable co-witness mounting point while minimizing weight and profile. The mount uses American Defense’s Patented QD Auto Lock Lever system to accommodate both in-spec and out-of-spec rail systems.

Product Specifications

• The product type is Mount.
• The model is AD-509T.
• The mount fits the Holosun 509T footprint.
• The size/configuration is Co-Witness.
• The color is Black.
• The finish is Hard coat T3 Mil-Spec anodize.
• The material is 6061 T6 aluminum.
• The construction is a one-piece precision machined unit.
• The attachment system is a Patented QD Auto Lock Lever system for quick detach and secure engagement.
• The mount is intended for AR pistols and other platforms requiring a small, lightweight red dot system.
• Additional feature: Quick Release.
• The subcategory is Optic Specific Mounts.
• The UPC is 810008517819.

Built for shooters who prefer low-profile, accurately machined mounting solutions, the AD-509T provides a secure platform for the Holosun 509T while enabling co-witness sighting lines. Its quick-detach lever and robust anodized finish make it suitable for repeated installation and removal without sacrificing repeatability. Choose this mount when you need a compact, dependable interface between your optic and rail.