Got some years ago what was advertised online as a "Chinese made" 9mm barrel for the TT-33; mine's a Russian-built 1939.
Installed it (Perfect drop-in) but the barrel locked itself against the bushing when the slide backed after each shot. Upon inspection noted the evident machined marks in the whole lenght of the tube, specially closer to the chamber, so took a rag, some polishing compound and buffed all the rough spots to a look closer to the original Russian 7.62 barrel. Not mirror-shine but smoother than it looked before.
Also replaced the original mainspring with a new one from Numrich. The rest is "as issued"
Lubed the barrel with some light gun grease, reassembled and took it to the range with the original 7.62 magazine (No converted 9mm. mag available) 9mm rounds did fit loose from the front but anyway the pistol ran with zero issues with every factory FMJ 115 & 124 ammo I could find except with the cheap steel-cased Winchesters (FTFs & FTEs).
Several boxes of ammo later (Maybe 700 rounds total) it hasn't failed again, not even with the original mag. Only used it as an occasional "range toy".