Not sure whether your replacement parts were upgraded. I know about the extractor from my pre-buy research. It appears to be popular problem one these. I know that manufacturer changed bolt for 2012 to fluted design. If they were changing stuff on the bold they probably fixed any open issues...
If your rifle didn't come with brake, fluted barrel and bolt it could be left over 2010 model. This could also explain your extractor (old design) problems. Cheaperthendirt has some of those left too at much lower price. I may decide to go that route.
I'm looking to buy 4x4 and would like latest model hoping that few bugs (extractor breaking etc) are going to be worked out. Also like the spiral fluted bolt look.
The problem I have is that it appears though that 2012 doesn't have skeletonized stocks any more. I would opt for sculpted one in...