Holosun Technologies 509 Adapter, Black, Low Mount, Fits Picatinny 509MNT-0.82-PIC The Holosun 509 Adapter for Picatinny is a rugged and reliable rail mount, perfect for use with law enforcement, the military, and the everyday shooter. 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.