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Last I heard, Remington was using pull through reamers, but maybe they are doing things differently now.
There are also other tricks by factories. For example, Springfield Armory (the government factory) used a gauge on the barrel threads to put on a witness mark, then used that to set up the sight bases and the extractor cut. That way they could do the cut and install the sight bases without the barrel ever coming near a receiver. Later, the witness mark was used to align the barrel during installation. The same system was used on the Luger pistol.
Mauser, with the 98, installed the barrel and headspaced, then used the receiver flat to line the barrel up for sight installation.
BTW, I was not joking about sights on the bottom; I have seen two like that. On one, the top of the barrel ended up at the left; the "gunsmith" had put plug screws in the holes, polished out most of the markings, and reblued the barrelled action. It was almost invisible. On the other, no effort at all was made to cover up; the sights were just taken off and the holes and markings left, literally on the bottom.
Jim
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