FWIW, often overlooked in the pursuit for precision shooting using AR platform is the time and dedication required to drive a gas gun to its max potential. I was right where you are at few years back, and have spent more $$$ and time to just barely make the OBR a part of the body and extension of the will, compared to if I had started with a solid bolt platform like the TRG. Furthermore, that state of proficiency is so very perishable...I mean from stacking 10 rds < 1MOA < 1min to having a "precision" scatter gun

So make sure you count that cost and have no regret.
Having said that,I concur with much that had been said:
- SIG 716 can use trigger replacement. Other than that, surprisingly capable to get sub-MOA with FGMM and it's more competitive price-wise than LWRC, POF, and other piston platform
- No experience with LMT
- No experience with GAP10. Now that George includes the adjustable gas block, it's more and more attractive than OBR though. Also keep in mind Larue does not do mil discount anymore...
- OBR is dead solid sub-MOA gasser. You can cancel the order right on shipping day, because another buyer would line up for it. I'm still irritated I shot the SR25 test rifle at 37 into smaller 1 hole 4-5 rds group than my OBR, though

Right, Rick? I forgot what excuse we came up with. Perhaps something along the line of rifle/barrel break-in

- I defer SR25 to those who've used them day in-day out, and had to deal with QC consistency