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.
If you haven't used them before, buy just one box first. Your firearm may not like them. Haven't a clue where to get 'em though. Try the usual places that sell Federal ammo.