Only need the bolt stop, you can modifying the existing one, but gun works sell replacement ones that are stronger than the factory one, not that I've ever had any issues.
The factory Tikka barrels are held in high regards by most people, they are made by Sako. If you are going to a aftermarket barrel the same length and contour as the factory one, you would save a lot of money by just going for a re-chamber. If it's a heavy or a long barrel you are after, obviously the factory one is no good (unless it's a varmint).
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