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Giovanni, for absolute co-witness you would need : https://www.budsgunshop.com/product_info.php/products_id/105005/strike+sirexriserbk+rex+riser+picatinny+style+black+hard+coat+anodized+finish

It has a Springfield Standard Footprint (Doctor/Noblex,Vortex Venom / Burris Fastfire) so there are many riser mounts you could use for this optic or optics listed.

Giovanni, the Burris fast fire riser mount you asked about would work great. Hope this helps link here........... https://www.budsgunshop.com/product_info.php/products_id/714000230/american+defense+mfg.+burris+fastfire+mrd+mount+with+qd+lever