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.
Ive got the Aimpoint PRO on mine. Its ok - only real great thing is that its rugged. Had the Burris LPVO on it - just wasn't comfortable to look through. Thinking about switching to an prism or Eotech + magnifier.