The Reptilia ROF-90 is a drop-in upgrade for magnified scope mounts. Built for the Reptilia AUS Mount or Geissele Super Precision 30mm optic mount, it adds a mounting point for a Trijicon RMR to provide a fast, close-range optic to your magnified scope. Each ROF model is designed to minimize each optics distance from the host scopes centerline, while ensuring enough clearance that the sight picture isnt obscured. Also compatible with: Holosun Technologies HS407, HE407, HS507, HE507, & HE508 Series