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 tried to fit a commercial Magpul CTR buttstock on and it didn't fit- I want to assume that it therefore is a milspec but want to be sure- is it milspec or out of spec?
A commercial stock will fit on either tube (very sloppy on a milspec tube). So either you actually have a milspec stock or the Norc tube is horribly out of spec.