I only have set up a few rifles with secondary RDS optics, prefer strong side offset (HK 556, LaRue OBR, SR-25). The 6-48 ACOG with RMR on top is a mother lode. Surefire's Barry Dueck has nice offset RTS (rapid transition sights) that I have on this Wilson Combat 6.8SPC2 SBR; No battery worries.