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.
Online with a search i would suspect, once you search thread pitch/length you can order online, otherwise a gunsmith near you might have them handy, but do him a favor and look up size and length first.
