The 34mm ROF-90 is a drop-in upgrade for Geissele Automatics' Super Precision 34mm optic mount. The ROF-90 adds a mounting point at 90Adeg (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 optic's distance from the host scope's centerline, while ensuring enough clearance that the sight picture isn't obscured. Features:Machined from billet 7075-T6 aluminumMIL-STD, Type III, hardcoat anodizedDrop in ready