Yet, he had bellows forges. Curiously selective. And explosives, for his fireworks. I think it was Saruman who did the industrial bit, and used wood for the fu

Yet, he had bellows forges. Curiously selective. And explosives, for his fireworks. I think it was Saruman who did the industrial bit, and used wood for the fuel. (No dwarven miners to hand, I guess? But orcs like it underground.) But inventing guns all by himself seems like a tall order, even given several centuries' plotting.