I absolutely love the 7.62x39 cartridge.
In the AKM department, I have Russians, Bulgarians, Hungarians, Romanians, Yugoslavians, Egyptians, And Chinese.
I even own a PTR 32 and a CZ 527.
My absolute favorite pinker though, is my TC contender pistol with a custom 7.62x39 12" barrel.
Accurate to about 250 yards. It's seriously fun.