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.
Don't know about the stainless detachable mag portion, but all WSM magazines I've seen only hold 2 rounds. This is one of the trade offs the short and fat cases take to get a "short action" rifle.
I too own the Browning lever in .270 WSM. It is the, lightest, handiest, most ergonomic, quickest acquisition gun I own. Most guide guns aren't this nice IMO. The magazine holds 3 giving 4 in total.