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 paid around $70 for mine but it also came as a kit to lap 1" rings and had some bubble levels..Cabelas was blowing them out. I dont have many scopes in the 1" diameter but I did lap one of my rings on a .223. Keep an eye out,,they go on sale quite often.