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Yes... The Holosun 509T has a proprietary mounting footprint that's designed to fit a variety of firearms. The footprint is designed to reduce movement and maintain zero under recoil. Features The Holosun 509T comes with an adapter plate that allows it to mount to handguns with an RMR footprint.

Hi Brian and welcome. Yes Sir. With the RMR Plate you could add a 407/c or 507c Holosun Red/Green Dot no issue. Cheers and stay safe! https://www.budsgunshop.com/product_info.php/products_id/128941/holosun+he+507c-x2+1x+multi-reticle+green+black+hardcoat+anodized