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've also usually had very prompt replies from them but then again I usually send a fax whenever possible rather than calling. If you have access to a fax machine it might be worth a try.
Maybe Iv'e been lucky , I just call the firearms center and have the call tranfered ( have done this several times ) and always get a prompt response ! So cannot say too many bad things so far !