I bought a barrelled action from MRC approx 3 years ago. It was chambered in 6.5x284 and would routinely shoot <MOA with most loads. When the barrel was shot out (1200 rounds or so), I bought a Shilen barrel in .284 Shehane. When I sent the action and new barrel to a gunsmith for headspacing and action truing, he stated that no truing was needed and installed the new barrel. This setup is now my F-class rifle (with Jewell trigger and new stock).
If the barrelled actions are the same quality as the one I received, I believe it would be a very nice rifle.
