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.
You could get Brownells to export you one. I have the A2 stripped upper on it's way for my retro build. A little bit of paperwork and a wait and boom it's here in your hands.
Put a WTB ad on the EE. I was looking for one for my C8 build. A few weeks of patience followed by a trade for a spare upper got me exactly what I was looking for.