Most or some Romanian barrels should have 4 numbers on the top of the barrel, toward the back.
Why? Smart thrifty people over there.. In America, if a building tool requiring very tight tolerances wears, we heave it..
To save money during the cold war years, nothing was heaved..
Not a machinist so bare with me here.. As the tool wore, tolerances changed ever so slightly.. Holes became smaller with wear..
Frist number should represent front sight.
Second. Gas port fixture.
Third. Rear sight.
Fourth. Trunion..
As a part was needed to complete the weapon, workers would go to say, barrel 4 for the correct trunion..
If they drank to much vodka the night before, they did not give a damn..
That is why de-milling some Romanians, you need a bulldozer to get the barrel out.. Lite sanding and lube to get it back in.. Or vise versa, loose fit..
Look at your Romanian barrel, you should see the 4 numbers..
The BIG Guide To Romanian AK Variants And Accessories! - Weapons Cache Forums
Go too "Other Markings" about a third of the way down the page..