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.
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Its not that hard to build one if you can find the parts. Although mine is not perfect its pretty good. Parker Hale 1200 bought from a friend with ph scope bases. C3 stock from board member. Kahles scope and parker hale bipod from ebay. Screwed it all together myself.