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.
Note: This feature may not be available in some browsers.
I did it with a old ERGO grip form a AR,You just cut it to fit,with a hack saw, a file and sand paper, work slowly removing small amounts of material at a time, keep checking the fit as you go.