Tech Sights RR200 Adj. Aperture Sight for Select Ruger Mini 14 & 30 Rifles Pre-2005 Models GI type rear sight for your Ruger Tech Sight's RR200 Adj. Aperture Sight for Ruger Mini 14 & 30 rifles pre-2005 certain models Easy Click Adjustments on Elevation and windage Standard .062 Aperture Easy installation.