Manufacturer's frequently only send us one image for an entire product line, so our images are not always of the exact item. This particular scope DOES have the side parallax adjustment.
To mount the BSA Optics Sweet .17 6-18x40mm Rifle Scope on a Ruger Precision Rimfire you could use a 1" diameter cantilever mount or 1" diameter rings. If you are going to use two piece rings I recommend using medium height rings for that rifle. The first link below will take you to a compatible cantilever mount, and the second link will take you to a set of rings that would work for that set up.
https://www.opticsplanet.com/leupold-177093-mark-ar-integral-mounting-system-1-pc-base-1-ring-combo-for-a.html
https://www.opticsplanet.com/vortex-pro-series-30mm-riflescope-rings.html?_iv_tube-diameter=1-in&_iv_ring-height=medium-0-dot-95-in
We do not carry this exact item in the color of silver.
No, this scope is specifically designed for the .17 HMR and .20 caliber rifles.
For something that is rated for magnum air rifles with reverse recoil, check out the BSA Outlook.
https://www.opticsplanet.com/bsa-optics-outlook-air-rifle-series-4-12x44mm-scope.html
No, it does not include mounting hardware.
The parallax adjustment is 10 yards to infinity.
BSA does not publish this information, but you should be able to order replacement screws from the manufacturer.
You can reach BSA by phone at 954-581-2144 (Monday - Friday 8.30am - 5.00pm CST) or by e-mail at
https://www.bsaoptics.com/contactus.aspx
Mark H.