The 34mm ROF-90 is a drop-in upgrade for the Reptilia AUS Mount or Geissele Super Precision. The ROF-90 adds a mounting point at 90 (12:00) for a Trijicon RMR to provide for quick transition to a non-magnified optic for close-range target engagement. Additionally, the RMR can be zeroed for use with use with subsonic cartridges such as 300 AAC Blackout, while allocating the magnified optic for use with supersonic ammunition. 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. The 34mm ROF-90 for RMR is immediately available in MIL-STD Type III, Class 2, hard anodize, black and flat dark earth colors. Also compatible with: Holosun Technologies HS407, HE407, HS507, HE507, & HE508 Series