Maadi AKM, Chinese Milled SKS, Ruger Mini-30
So far, all of the above like the Winchester USA 7.62x39mm and no ill effects have been noted, over the years. I do shoot more Non-US made steel cased ammo through them though, with the exception of the Ruger Mini-30, which gets mostly Brass cased Ammo, domestic or foreign.
The 7.62x39mm Ammo that you
should be afraid of is any of the Chinese made stuff, that may be lingering around. The box may say it's Non-Corrosive, but it is! Horror stories of metal pitting, rusted op rods, and other misc. damage abound!
Sorry to hijack the thread. It just drifted into a 7.62x39mm thread.