In Song Lizong's Kaiyuan Year (A.D. 1259), Shou Chunfu fought against Mongolian soldiers and civilians who invented muskets. This kind of tubular firearm takes a huge bamboo tube as the gun body and contains gunpowder and bullets. After the fuse is ignited, the powder explodes and the "bullet" pops up, with a range as far as 150 steps (about 230 meters). This is the world's first rifle that fires bullets.

Firearms, also known as muskets, can be regarded as the predecessor of modern firearms. In the mid-Yuan Dynasty, this kind of tubular firearm was changed from bamboo to metal, so it was called? Americium