Many Russian weapons turned up in Viet Nam - My recruiter brought back a Russian rifle. Cyrillic characters, 7.62 x 39.
There seems to be a common condition of captured/confiscated weapons brought back from Afghanistan too - the almost total lack of a finish. Maybe Ed can comment on that. I've seen three souvenir handguns brought back and they are all old [WW II era] and have maybe 1 - 2% of bluing left on them. All different makes.
And no cleaning kits.