Turbo almost got it.
PBRs are control round push feed (sliding plate extractor and non-coned breach), non-trued, but do have the same two lever trigger as the SPR.
PBR-XPs have the non-rotating claw extractor of the SPR, coned breach, two lever trigger, but still non-trued.
TSR-XPs have the non-rotating claw extractor, coned breach, three-lever "MOA" trigger. Non-trued.
SPRs are the only ones trued from the factory. SPR has not changed from inception: trued, chrome lined barrel, claw extractor, coned breach, two-lever trigger.
SPRs with black McMillan stocks (easiest way to identify a non-bedded SPR) carry the MOA guarantee. SPR-A3G is bedded into a green McMillan A3 Adjustable stock and carries 1/2 MOA guarantee.
PBRs, PBR-XPs, TSR-XPs all sit in a Hogue stock and are all guaranteed for 1.5 MOA. Most shoot much better than that.
Hope this helps.