I have a "Russianicon re-work" K-98 here with a barrel that is not only a little "shabby" internally but has WAY too much headspace.

Pulling and replacing the barrel is not the issue; I "have the technology", (thank-you to the nice folk at Brownells).

The trick seems to be removing the sights and re-fitting them on a replacement barrel, of which I have several.

The SMLEs and No4's I usually have on my bench don't have their sights soldered on.

Any clues as to how best tackle this? I have been told to pack the bore with finely-crushed charcoal to reduce nasty oxidization effects from the heat needed to remove and install the front, and especially, the rear sights.

Any advances?
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