Are you shooting F Class with it? If so, don't get a swivel bipod, you don't want anymore movement than necessary.\
I'll respectfully disagree with this one. Many firing lines aren't paved, and it helps a *lot* to be able to level your gun so the scope is plumb and your elevation clicks actually go straight *up*. Even on ranges with paved firing lines, I've seen more than one where the firing line isn't necessarily level, nor is the target berm. Being able to compensate and not have a gun canted side to side helps. With a fixed bipod and the sliding (vs. notched) legs you could still level things to a fair degree, but my recommendation would be for the BRM-S model (6-9", swivel with notched legs). Add a scope level aka 'anti-cant device' or ACD and a Pod-Loc so you can snug it down once level, and you should be good to go. For rings, the Ken Farrell bases work very well, if a bit heavy and high. EGW makes a lighter aluminum rail that is inexpensive, but you should have plenty of wiggle room in terms of weigh even with the Farrell, and you can get a 30moa rail if you want it (EGW I believe maxes out @ 20). The extra height of the Farrell base actually helps a little if you are shooting a big scope like a NF 12-42x56mm; I actually go with medium height rings on that base. On other bases I may have to go to high rings to have the scope bell clear the barrel. For scope rings... the Burris Signature Zee rings with the posi-lign inserts work very well on the F/TR rifle... as you can use the inserts to center up the scope for windage a bit rather so you are mechanically centered and can get the most usable windage out of your scope at longer distances.
YMMV,
Monte