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.
However, you can't take an R3 off a synthetic stock and put it on a wood one; it's made to fit into the synthetic stock, whereas the wood ones screw flat onto the back, and the screws for the synthetic sotck pads are smaller than the ones for wood stocks.