Chris,
Whether the "R" stands for Russian, Radius or Raped-Ape, I believe that Mike's barrels are as good as they come. We are shooting Rocks a lot these days in a big bullet test and the barrels are shooting sub-1/2" with consistency - if we hold the rifle decent. Plus they clean up with no effort at all.
Last week Mike's barrels accounted for several +500 yard kills on mule deer, plus one at over 700. My buddy Wayne (George and Marty know him) shoots a 26" Mike Rock barrel on his custom Rem. and I hunted with the very evil ROCK. Tell George that my "ROCK-rifle" just keeps piling them up. The ROCK placed a 150 grain Hornady Interbond right behind the shoulder of a small mule deer fawn last week at 520 yards in very substantial wind. This was during a CWD cull hunt. The ROCK is going culling again next week, more mulies will be biting the dust. The fawns are edible without testing, apparently they cannot have CWD but the gov't wants them shot to reduce deer numbers.
As mentioned, Mike is a very good guy, one of the most dedicated people I have ever met. He is completely passionate about his trade, "art" would probably be a more correct term. I believe the same can be said about Danny Lilja, another very fine person and superb craftsman. They are unique individuals - seems that runs in the barrel making fraternity.