Most of these weapons are open-bolt, and if you've ever handled one you know you have to move the charging handle back into the forward position after you lock it, it doesn't snap back into place. All these charging handles do is force the bolt assembly into the rear position and lock it into place. They shouldn't be connected to anything permenantly.
I don't think either of those having charging handles that are connected to the bolt and carrier assemblies as well. You'd be hard pressed to find a lot of weapons larger than machine pistols and SMGs where the charging handle cycles with the action.
Actually, I know what weapon you mean. I think you have seen footage of the old maxim guns and their immediate derivitives. I have seen old movies of crew served weapons with the charging handle pounding away. I remember being thankful they put a stop to that. Can't remember the exact make or model, but they were definitely NOT modern weapons. I don't even think they were 2ww, but if they were that was the end of them.