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Tommy you will need a Red Dot sight with a mount that will allow the dot to "Co-Witness" with the front sight post. Examples are : https://www.budsgunshop.com/catalog/product_info.php/products_id/85124/Bushnell+AR731306+TRS-25+1x+25mm+Obj+Unlimited+Eye+Relief+3 or https://www.budsgunshop.com/catalog/product_info.php/products_id/714012271/KONUS+SIGHTPRO+ATOMIC+2.0+QR+RED+DOT or https://www.budsgunshop.com/catalog/product_info.php/products_id/77221/NCStar+DMRG130+Red%2FGreen+Dot+1x+30mm+Obj+Unlimited+Eye+Relie or https://www.budsgunshop.com/catalog/product_info.php/products_id/712013252/NIKKO+ACOG+1X32+RED+DOT+SIGHT+UNIVERSAL

Or you can use whatever red dot you want along with a riser. https://www.budsgunshop.com/catalog/product_info.php/products_id/712007347/SUN+AR-15+FLAT+TOP+RISER+2+EXT+BASE%2FPICATINNY you can get risers in different heights so you can get the perfect co-witness

I have an AR with a fixed front site. I have a red dot to co witness with it. Of the rifles I own I like this set up because if the battery dies I have a flip up rear sight on the rail as a backup. So it's worry free.