Open box/Demo products will retain the same factory warranty provided by the manufacturer.
I would recommend emailing us at Techsales@opticsplanet.com and letting us know what caliber your Remington 700 is. This is important because there are differences in the bases/rings for either short or long action models.
There are a few things that will determine the rings you will want. If your rifle already has bases such as a picatinny rail these rings here should work.
https://www.opticsplanet.com/leupold-backcountry-cross-slot-30mm-rings-med-matte.html?_iv_tube-diameter=1-in&_iv_code=LU-RR-MED-175118&_iv_ring-height=high
Now if you need bases for your rifle still it depends if you have a Winchester Model 70 or Remington Model 700. Here is a base for a Winchester Model 70:
https://www.opticsplanet.com/leupold-backcountry-cross-slot-win-xpr-sa-1-pc-20-moa-matte.html?_iv_parent-gun-make=winchester&_iv_gun-model=winchester-model-70
Here is a base for a Remington Model 700:
https://www.opticsplanet.com/leupold-backcountry-cross-slot-rem-700-sa-1-pc-matte.html?_iv_parent-gun-make=remington&_iv_gun-make=remington&_iv_gun-model=remington-model-700