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.
Rebarrelling a Model 7 is no different than rebarrelling a Model 700. Same barrel shank dimensions.
You will likely need a new stock if you are going to a heavier barrel.
Why fluted? For appearance?