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You should ask Beretta as I could not find that spec You may contact us directly by dialing 1-800-BERETTA.

I also couldn't find the exact measurements, but this is designed to fit a Beretta 1301 ,or TX4, so the holes will line up with the drilled and tapped models of those 2 shotguns, if your looking for a rail for something else you could alwaysbhave a machinist or gunsmith drill and tap it with this rail as a template, or post a new questionhere in the community with what your looking to out a rail on and maybe one of us could find you something that'll work with no modification needed