I have both a 3 - 18 and 4 - 27 gen 2's and they are a lot of scope for the money . Also Vortex dropped the msrp 2ish or so month's ago . The Burris XTR2 and 3 is also a good choice for less money .

Rings and bases are fairly simple since the action will take Rem 700 pattern bases . Get a good 1 piece picatinny base and rings that are the right height . The Vortex branded rings are made by Seekins and are GTG . EGW also has some economy priced stuff that is good quality exceeding the price .

Get a base with at least 20 MOA built in to it 30 would probably work also but 40 will be most likely too much to keep a 100 yard zero .

Another option is buying used glass from manufacturers with good warranties because they typically transfer with the scope .