While you are on the site, in your browser find and click "Add to Home Screen" A CGN beaver app icon will then be created to your phone that is directly link to the site.
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I have a buttstock here off a Dominion Arms Grizzly that should be the same but since I'm not home I don't have a caliper. Best I can do is with a tape measure so not real precise. Depends how accurate you need the measurements to be.
