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 went with a Pic rail because it offers more flexibility with base/ring placement. Weaver is certainly less expensive but I ran into fitting / eye relief problems with the scope I intended to use... I suspect that the OP experienced same.