First off; A barrel that actually has rifling is probably a bargain at 155 dollars!
Shilen and Douglas are stamped with the maker's name. The MRC's I have had were stamped only with the groove dia and twist.
I have installed a few MRC barrels and can speak only of those barrels I have used.
Every one has shot very well. The bores have been smooth and the barrels showed little tendency to foul. All have been properly stress relieved and shown no tendency to move during the profiling operation.
The only downside is that not a single one has been straight. In fact, most have had enough of a curvature to the bore to make setup for chambering difficult. I finally ended up installing the barrel into my action truing fixture so I could get the chamber section to run true enough to get a round chamber.
During manufacture, the barrels are drilled and reamed then straightened. The problem seems to be (a) the drill runs out excessively, and (b) the guy doing the straightening doesn't have a particularily good eye. After straightening (?) the barrels are stress relieved. I've looked through the blanks prior to rifleing and they are invariably visibly crooked. After straightening, they are still visibly crooked. They should not be all that crooked after drilling and reaming so I suspect there is a problem with the drilling setup.
I have spoken to others who have used them and they didn't seem bothered by the lack of straightness. One fellow simply explained to me how they couldn't be crooked and how one could set up to turn them so they had to end up straight. I felt I was seeing a level of ignorance which would be impossible to correct so I just thanked him for the info.
As I said, curvature notwithstanding, they have been very good shooting barrels and I wouldn't feel too bad about owning one. They are just a little more difficult to handle if one wants to try for perfection in a chambering job. The other thing is, I really like the manufacturer. These are great guys who are doing their best to produce a decent product at a decent price. Regards, Bill