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I would contact Sig and ask them to get a 100% correct answer as I have found it listed both ways 603-610-3000 option 1 8:00am – 5:30pm EST.

Mathew, Sig puts the Pro 3 3 moa on the defensive pistols and the Pro 6 6 moa on the competition pistols generally. So I would think the Pro 3 is mounted on the P320X compact.

Matthew, the P320 X-Compact comes with the ROMEO1 PRO Reflex 6 MOA Optic. Details here : https://sigtalk.com/p250-p320-p320-x-5-pistols/369884-new-sig-p320-rxp-pistols-romeo-1-pro.html