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Hi Dan and welcome. This model has an RMSc Cut Optics Slide. RMSc Optics, Holosun 407k or 507k will work no issue. Recommended Holosun 507k: -- https://www.budsgunshop.com/product_info.php/products_id/137909/holosun+he507k-gr-x2+reflex+sight+multi+reticle --------- Or the Meprolight: --https://www.budsgunshop.com/product_info.php/products_id/162803/meprolight+usa+901141171+mpo-s+black+1x20x15mm+3+moa+red+dot+33+moa+bullseye+ring+reticle+illuminated -- Cheers, stay safe and enjoy!