Preface: My only experience with pistol mounted RDS is in the more "traditional" configuration where the rear sight is behind the RDS. Also Cowan has significantly more time behind a RDS (and shooting in general) than I do.
I currently have two RDS equipped pistols, a G17 (milled) and a G19 MOS. Both are gen 5. Both have Holosun 507C's. The G19 has a 1st gen optic and the G17 has a 2nd gen optic. I run both optics with the circle dot reticle because it works better with my astigmatism than a dot by itself. Both guns have tall Ameriglo backup sights that cowitness in the very bottom of the sight window, maybe the bottom 1/4. Maybe even lower. I have never felt my eye was drawn to the rear backup sight when acquiring a sight picture. I specifically went with blacked out sights for this reason. I didn't want bright/dot sights competing with the red dot or target for my attention.
I would be interested in trying out the RDS-in-the-rear configuration, but based on my experience so far I haven't found the traditional setup lacking, and would stick with it if I were setting up another gun today. Based on my experience laid out here I voted for behind the optic.
Steve
Disclaimer: I am employed by Shadow Systems. My posts on this site are my own and do not necessarily reflect the views of my employer.
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