From what I understand they are fully strait and ready to screw the barrel on. I would always check the action first just to make sure that somthing diden't slip through but if I had to do any work to one to make it strait then I'd be looking for a bit of a refund. I have heard a few guys say that they had to have an custom action (couple differant ones) cut on a little bit to make it strait and when the contacted the action maker about it they were told it was withing their spec , so when it comes time for me to build on a custom action I'll be talking to the maker about what their specs are.
On the dozen or so Predator actions, I've put barrels on, the specs have been amazingly uniform. This is the primary reason I believe them to be the best "bang for the buck" when choosing an action for a varmint or hunting rifle.
The last thing I want is to pay for a custom action and have to true it. I have all my custom rifles built on Remington Actions and I am happy with all of them. A lot of guys will tell you use a custom action. I like the looks of the Stillers, and heard good things about them, but would hate to have a smith tell me it needs work. I was looking at the TAC338 for a 338 Lapua, after I get the rest of my parts for a 6.5x55.
"A tie is as good as a loss, and no one remembers second place."