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Hawg is right. He should not have even considered cutting on the receiver to make a takeoff barrel fit. The barrel shoulder would not have to be lathe turned back very far, 3/4 turn = 1/16" on the 12 tpi Mauser barrel thread.
I would not have thought it would involve the rear sight base which I assume you mean by "sleeve."
Once upon a time, a reputable gunsmith would be sure to have a lathe. Replacement barrels were sold with full length chambers so any headspace adjustment would be made by setting the barrel back a bit. No reamer required, just a headspace gauge.
Nowadays, people want to get in the business for cheap or/and in a small space, so replacement barrels are usually short chambered so headspace is set with a reamer and the lathe is not required.
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