Putting together a build with one of the MA-TEN sets from the Group buy and Im looking for a barrel. I see that Rainier Arms has a pretty reasonably priced 20" barrel and I was wondering if anyone here had any experience with them. I see that it starts life as a Shillen blank, so I expect it to be fairly high end, but its about half the price of a Rock 5R, so I'd like to know what you guys are experienceing with them.