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.
Note: This feature may not be available in some browsers.
I suspect you will have to find some weaver mounts that will match, you can probably get the diameter of the barrel and spacing of the holes and try and find specs based on that.
If you have a local shop/gunsmith with weaver bases just bring the gun in and try the mounts on it until you find the right bolt spacing and one that fits the curve of the receiver, then you just need to make sure the back and front heights match. If you need a different height once you find the radius that fits weaver lists the specs of each mount on their website to compare.