With no round in the chamber there should be a .005” or so gap there. (last two pictures you posted)

With the headspace set correctly, the bolt touches the back of the round. The bolt stops should not touch the bolt and that .002” feeler gauge should fit in there.

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Hopefully the barrel I sent moves the round into the receiver enough so the bolt doesn’t hit the stops with a round in the chamber.

The bolt might be hard to close or it may not close at all if that happens. That is to be expected. We need to get the bolt off the stops when there is a round in the chamber first. Then the headspace can be set with the right size locking shoulder.