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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Hahahahha - I quite literally just came inside from doing this
You need a puller - drift the front sight pin out, remove as much as you can to avoid accidentally damaging it, put an alu/brass cover over the muzzle, put a brass or aluminium collar around the sight (two piece with a hole in the middle bolted together) and pull it using a gear puller.