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.
Try contacting your local gun smiths (repair shops) as many people open them apart to clean them and don't know how to put them back together.
Also try your local free buy & sell classified papers like the Bargain Hunter and Buy & Sell.