American Defense Holosun 509T Co-Witness QD Mount

The American Defense AD-509T co-witness mount is made specifically for the Holosun 509T footprint. It uses a quick-release base and places the optic at a co-witness height. The black anodized finish keeps the mount visually consistent with the sight and other black rail-mounted hardware.

This version is the co-witness option in the AD-509T family, so height is the key difference from the lower-one-third and low models. The dedicated 509T interface means the optic attaches directly to a base intended for that footprint instead of a generic adapter. Quick-detach hardware keeps the sight and mount together when the assembly is removed from the rail.

For a Holosun 509T setup that calls for co-witness placement, this mount keeps the configuration simple and purpose-built. Buyers who want the sight higher or lower can compare the other AD-509T heights without changing optic footprint. More red-dot mounting options are available in optics and rangefinders.

• Dedicated Holosun 509T footprint
• Co-witness mounting height
• Quick-release attachment
• Black anodized finish