Looking for help Franchi Affinty 3 owners

[huntallday]

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I have a Franchi Affinity 20 ga. with a 26 inch barrel. I was hoping if someone with  an Affinity 3 could tell me the measurement from front of the receiver to the first drilled hole for mounting a sight. Would like to drill my own to accommodate a red dot scope.

Thanks in advance,
Frank