If it was me, I'd probably put a totally new setup on it. Not that it wouldn't work, but it looks like its not super high dollar, and in fair condition at best.
I have a nice millet 1pc base that uses typical Leupold std style rings ... if you want it I'll sell it to you for the cost of shipping. I have no use for it, sold the gun long ago.
Uses these style rings:
standard rings
This is what the base looks like, but Millet brand
base