Michael, since the Q5 Match comes with Trijicon RMR, Leupold Delta Point, and Docter Optics ready mounting plates, I would recommend the "Leupold Delta Point Pro" w/rear sight : budsgunshop.com/catalog/product_info.php/products_id/95941/leupold+119687+deltapoint+pro+1x+obj+unlimited+eye+relief+75+moa+black (Quality and function for a Penny).

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Hi Michael, The New Nikon P-Tactical one is very nice. I use it on mine and love it. budsgunshop.com/catalog/product_info.php/products_id/712016045/nik+p-tac+spur+reflex+sight

Michael - I always recommend the Vortex Venom - based on my own experience with it. It is solid, durable, serves the purpose very well, and comes with a lifetime "No Questions Asked" warranty from Vortex. Buds does not appear to stock them, but they are widely available on the internet. Comes in both 3 and 6 moa dot size.