Damm, too bad that article is in Russian, it would be the first real evidence of flaws in the US mosins I have seen. Tried the link but could not find the server came up. All the US parts I have personally examined where first rate but of course are not in their original state. I think Andy has a bannerman but that would have been a later production example.
It wasn't only a problem of rough finish; one of the main gripes was maintaining tolerances or lack thereof.
The usual test was to disassemble 10 randomly picked Mosins, mix the parts and rebuild ten rifles with them.
Then the rifles were tested for repeatability, operation, headspace and accuracy.
This was to insure that field armorers be capable of refitting rifles on the spot with very little problems. Ever had heaspacing problems with a Mosin?
The first US-made Mosin did not meet these criterions and inspectors sent to the US had problems to get what they wanted.
When Communists took over control, they put an end to the Czar's contracts. Most of the remaining US Mosins were kept as training rifles, sold to civilians or sent to the Finns to help them titillate the Russian Bear's mustache...

The Finns lost no time turning these in useful fighting tools.
By any means, buy them before someone with a hacksaw gets creative...

PP.