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David, virtually any AR style flip up sights will work. I have been using SUOFORCE sights on my rifles for years and have been satisfied with their durability and performance ------ https://www.ebay.com/itm/Low-Profile-Flip-up-Metal-QD-Rapid-Transtion-Sight-Iron-Sights-Front-Rear-Set/184106208974?hash=item2add95cece:g:vHYAAOSw~tJeCsA0

There is one that has ghost rear sight and front sight already installed. The hand guard is different. https://www.budsgunshop.com/product_info.php/products_id/415008068/ruger+pc+car+9mm+rfl+10+b+threaded+barrel+ffh