@Ysabet To be fair, there is a hidden secret with guns... a few, even. It's just that the secrets are in having gunpowder (which I think the Japanese had), coming up with the idea of using the gunpowder to propel a solid projectile down a tube rather than using the explosive as the primary weapon, and then finding a way to make an apparatus to do that which is strong enough to (usually) hold up to the internal explosions being produced, light enough to be carried by a person, simple enough to operate that it's actually practical to use with less than three hands (some of the really early firearms weren't...) and simple enough to make that they can actually realistically be mass-produced. Figure out all that, and actually USING it is easy!
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@Ysabet To be fair, there is a hidden secret with guns... a few, even. It's just that the secrets are in having gunpowder (which I think the Japanese had), coming up with the idea of using the gunpowder to propel a solid projectile down a tube rather than using the explosive as the primary weapon, and then finding a way to make an apparatus to do that which is strong enough to (usually) hold up to the internal explosions being produced, light enough to be carried by a person, simple enough to operate that it's actually practical to use with less than three hands (some of the really early firearms weren't...) and simple enough to make that they can actually realistically be mass-produced. Figure out all that, and actually USING it is easy!