Hmmm. Must be the bolt itself and not the extractor. I would contact remington and see if they will make it right.
I just changed one out last week, but my smith had one on hand. It takes 5 minutes.
Otherwise, a Sako extractor will run you a minimum of $100 installed, depending on where you go. I would make sure you have somebody do it who fully bushes it. Another good thing to do when having the Sako installed on a rebarreling job, is to slightly take off some of the bolt's rim or nose, so that the cartridge goes further into the barrel......