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.
Questar.ca has the only ones I know about. I bought the M4 styled .22LR upper. Fits great on my Norinco AR lower. Uses the black dog machine 27 round magazines.
