As I said, the Real Sword AKs are that tough because externally, they are basically real guns, and just as tough as a real AK. AKs are reknown for their ability to take abuse that would put any other gun out of commission instantly. I doubt you could drive over a real AR or blow it up and have it continue working.
But I can understand wanting a tough gun, and that's why I chose CA. I know damn well that none of my other guns except the Real Sword could withstand the abuse that my CA can. Not that I abuse it, but I know if I drop it, throw myself on the ground, knock it on trees and rocks, etc - the normal wear and tear you put an AEG through at a game - that it will survive without issue. I don't have to worry about keeping my gun safe while playing. I just play.