Unless the gun has to be an AK.

I'm trying to talk myself out of buying a rifle in 7.62x39. I've already got .308 & .223 rifles.

Part of the issue is NOT using junk, steel-cased ammo. Brass only.

.308 is heavy, typically with fewer rounds in a magazine, and expensive.

Quality 7.62x39 has the same issues, plus far less bullet selection, wind resistance, and range.