The NcSTAR 3x Magnifier comes with RB24 Ring Mount. Prismatic lens is used for a clear high definition image quality. It has 30mm magnifier body diameter, for compatibility with other mounting options.
NcSTAR 3x Magnifier Features
Fully Adjustable for Elevation and Windage, to get your Primary optic's reticle centered in Magnifier.
Quick Focus Ring to get your Primary optic's reticle in focus.
RB24 places the center of the 3X Magnifier at 1-1/2" above the rail, a popular AR15 Optics height.
30mm Magnifier body diameter, for compatibility with other mounting options.