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With the proper adapter plate.

Hi Dan and welcome. Not without a Plate. For true co-witness you would want the version here for direct mount: https://www.budsgunshop.com/product_info.php/products_id/152891/green+multi-reticle+enclosed+aluminum ---------- Cheers, stay safe and enjoy!

Hi Dan, no sir, this will not fit. The Holosun SCS320 will be a direct mount on the Sig 220 budsgunshop.com/product_info.php/products_id/152891/green+multi-reticle+enclosed+aluminum , Stay safe & have a great day!