A brass/bronze brush should also take the rust off and be gentler on whatever remains of the finish on the metal.
They might be hoping for enough people to get angry at the government when they realize all the cool stuff they're seeing can't be imported, unless the new facility in Armenia is going to make them for export or something.
Vid related.
I think the only options until more Prvi gets imported (supposedly in summer according to an SGAmmo email from months ago) is buying GP11 from Edelweissarms or gunbroker, or reloading.
Did the Japanese Type 30 barrel use the same thread diameter and pitch as the Type 38 barrel?