I posted this in commieland once, I think it might have been too much for the fudds. This site is a good resource for RDS footprint standards and modifications to those standards. Pretty much all questions regarding compatibility can be answered without starting a thread that ends in arguments and buffoonery, lol.
www.optics-trade.eu

Footprints/Mounting Standards on Red Dot Sights - Optics Trade Blog
In this article, the most common footprints/mounting standards used on red dot sights are listed. Each standard is described and an image of it is added.

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