Clearly the sear is hitting something when you try to depress the bolt release, so that's what you need to relieve around. in the stock. On either side of the stock above where trigger slot is, you'll see a relieved area for the sear - it's wider than the rest of the inlet for the trigger area. The sear is contacting one of the edges in that enlarged area and causing it to bind, thus that's where you'll need to open things up a little.
This is an Axis stock, but the inlet is pretty much identical in the trigger area.
One trick is to put some Inletting Black on the sear and then reinsert the barreled action into the stock and tighten things up. When you pull it back out you should be able to see exactly where it's rubbing because the inletting black will have transferred from the sear to the stock.
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