corrosive...no big deal...if your lazy...takes like 30 seconds to pop it open and pull the bolt, soak it and the bore in WD40 then put it back together. (WD40 neutralizes the corrosive salts in the primers)
or take 5 mins and do it proper...its the best design for maintenance....love it....
just polish the chamber because new 7.62X39 barrels don't like lacquered cases..they tend to stick...
or a really nice vendor with a in house gunsmith could do this ahead of time..wink..wink