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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Sparc II - Mostly as it's smaller and lighter - if you can find them. I have been having a hard time finding one recently. I have a Sparc II on my NEA and a Strikefire II on my PWS. Strikefire works just fine, but it's much bigger and sticks out like a cold sore.