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 believe you are correct (if the SKU # on Wanstalls site is the Mossberg Model #), according to the Mossberg website this is a matte blued, 18.5" barrel. "Heavy Walled" isn't stated, unless this is a special run - but I'm assuming it's a misprint.