Yes, they "became known as macs". But that is NOT what they're sold as now. MAC is now slang. It is not a proper name for currently marketed firearms. What don't you understand?
I never posted anything for a semi auto Ingram. Never claimed to. Semi auto COBRAY is what I posted.
The books are published for a reason; they work. If they don't, why don't YOU publish one that does? Hmm?