Nine years ago I saw in SGN that SARCO had "dark bore" Yugo ReArsed K98ks for $110 (the regular Soviet ReArsed K98ks were selling for more than twice that). I knew that if SARCO listed them as "dark bore", they were certainly nasty.
I had a spare, excellent-bore, take-off, K98k barrel in my kit so I bought one of the SARCO rifles with the intention of swapping out the original barrel.
I must say that the rifle I received sported THE ugliest uncleaned bore thru which I have ever peered ... but my first step with new rifle is a full cleaning, so ...
After cleaning, the bore was still a black hole ... pretty ugly ... but there was distinct and surprisingly good-looking rifling ... AND the muzzle gauged
very well. Hmmmm ...
I took it out back, proofed it and then fired it for accuracy ... and found it to be acceptably accurate.
So I ordered another $110 K98k ... and this one sported a true sewer pipe bore, so it got the new barrel and shoots great, also.