It sounds like you answered your own question.... You said you think it's set up for WEAVER mounts.... I have a 111 and it is setup for weaver style mounts. However, You can also run a Picatinny single piece rail in either 0 MOA or 20 MOA. I'd go with the 0 MOA rail or regular weaver mounts for what you have mentioned it will be used for.
Rings will be determined by your scope size, the size of your objective lens, your barrel profile etc... There are better rings out there than Leupold though....
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