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.
Likely just the clamshell plastic around the action that makes it look like an MP-5 or an AR. I had the top one for a while, it was fairly reliable and fun but very cheap feeling in my hands.