Holosun Technologies 509 Adapter Holosun 509 Low Mount Fits Picatinny Black. CNC machined with 6061 aircraft aluminum with a Type III Hard Anodized Finish" this rail mount is designed to withstand even the hardest-hitting recoil as well as rough use and abuse in virtually any tactical environment. Further" the stainless steel torx head M3 screws help you to securely mount this rail to your firearm for a snug" wobble-free fit for your Holosun 509 optic. This mount comes with a lifetime warranty against manufacturing defects so you can experience reliable long-lasting use. Specifications for Holosun 509 Adapter Plate: Manufacturer: Holosun Color: Black Gun Rail: Picatinny Features of Holosun 509 Adapter Plate: Compatible with Picatinny rail systems Package Contents: Holosun 509 Adapter Plate