Thanks, I had worked that out the only thing is when I make similar systems I never get much flint. I tend to use Thermal Expansion though and I see you have used other mods. Maybe your setup is better at getting gravel (or flint directly?)4 flint in the crusher gives 1 gunpowder. But since you can get flint form gravel its not a huge issue. In the screen shot each barrel is next to the machine that makes the product.