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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Do you want to be able to adjust it on the fly? If I went with a chassis, I would use an MFT Battlelink stock. Big advantages to being able to adjust your LOP on the fly if you're doing any positional shooting with the rifle!
I have 2 chassis with the skeleton stock. I have zero wiggle play, they adjust perfectly and don't move even after banging it around the hills on a 4 day hunt.
Those guys over there make bang on product... when they have them in-stock that is...