Having just built a couple of these, I would say no.
The machine work is pretty dern good straight from the factory. On one we did mill off the chamfered face of the action and machined/installed a tombstone style recoil lug. It was done cause we can and cause its what the cst wanted. It was a light caliber so it prolly would have been fine with the stock setup.
These are pretty neat little receivers. Triggers are decent too. Buy with confidence.
C.