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Dave, this is not compatible. This has a picatinny mount on it for rifles, this won't fit a sig p320. Sorry but hope this helps.

Dave, unfortunately no. You would need a Pistol Sight like this : https://www.budsgunshop.com/product_info.php/products_id/140401/sig+sor01000+romeozero+elite+reflex+sight

Dave, no this mounts to a picatinny rail. Have a great day!