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 am using the low Leupold PRW rings on the rail on my T-3 CTR, and the height is right where I like it, just a slight clearance with Butler Creek flip ups on my Nikon Monarch 5-20x44 scope.