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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I'm also a big fan of this forend - have a Surefire light and a UTG foregrip installed on mine right now and have no problems. Only thing is you may find it too snug to fit over the Grizzly forend tube as it is slightly larger in diameter than an 870's. A file or some sandpaper will take care of that pretty easily though.