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.
There is a YouTube video which shows a work around. They guy sands the baseplate on the OEM Glock mags and gets them to work but you shouldn't have to do that, IMO. Also, Magpul specifically states they aren't compatible with replaceable backstraps, btw.