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Andrew, once you add a rail, if you don't have one already, you can use virtually any red dot : https://www.budsgunshop.com/catalog/product_info.php/products_id/711004292/no+gunsmith+shotgun+mounts+remington+870%2f1100%2f1187+12+gauge+and -------------------- https://www.budsgunshop.com/catalog/product_info.php/products_id/711005632/trophy+trs-25+red+dot+sight+1x25mm+3moa+reticle+matte+black ----- (https://www.snipercountry.com/best-shotgun-red-dot-sight-reflex/)

just about any of the red dots will work but you will need a saddle mount to be able to install it. This Bushnell TRS-25 is very good https://www.budsgunshop.com/catalog/product_info.php/products_id/711005632/trophy+trs-25+red+dot+sight+1x25mm+3moa+reticle+matte+black . saddle mounts https://www.budsgunshop.com/catalog/search.php?q=remington+870+saddle+mount&type=