Not too many rounds yet, unfortunately - maybe 400? Between a looming work deadline and poor weather, there's been no extra time. I've been out three times with it: 1. to sight in the optics, 2. shot the Aurora 3Gun match with it in March, 3. for the brake comparison I posted above. This weekend I plan to get out for some serious shooting.
Since the OPSINC brake isn't effective compared to the JP brake on my competition rifle, I put a specially-milled Vortex on the MRP - might as well go "tactical" all the way.
The JP bolt carrier is running perfectly. I expect no problems since I run it in three other rifles with absolutely no B/C related issues. The bolt itself is the LMT enhanced, as I mentioned before.
I don't expect any internal receiver wear. The anodizing inside my old 3Gun upper (a RRA) was only lightly polished after maybe 8k rounds. The finish on the LMT parts seems harder than the RRA finish.
-z