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.
Im not sure about the rail, but they did say the magazine is 5/10 as they are still designed for semi Autos they are limited to 5. If you want 10 you still need pistol magazines even though it's a bolt rifle.