My Bushy and my Les Baer AR's will eat either. I just don't like the laqured stuff, I prefer plain steel, if I'm shooting steel cased ammo. And yeah my AK eats whatever.
I keep a small spray can of Rem-oil handy when shooting steel case. A little squirt into the chamber before shooting and after a couple of hundred rounds and it works like a charm. I've been shooting some of the Herters using a slide fire stock and it has fed fine.