The Holosun 509PLT-FN509T is an adapter plate designed to mount the Holosun 509T optic onto FN 509, 510, or 545 Optics Ready models. This adapter plate ensures a secure and stable fit, enhancing the shooting experience with precision and reliability. Crafted from durable materials, the 509PLT-FN509T is built to withstand rigorous use. The sleek black finish adds a touch of modernity to your firearm, while the easy-to-install design makes it accessible for both new and experienced shooters. This adapter plate is trusted by shooters for its reliability and longevity.