Holosun 509 Adapter For Hs507c Footprint - 509PLT-507C. Specifications for Holosun 509 Adapter For Hs507c Footprint: Manufacturer: Holosun Condition: New Red Dot Sights-Footprint: Holosun 509T Package Contents: Holosun 509 Adapter For Hs507c Footprint