To fix this issue, Pennsylvanian machinist Michael Crumling made a special type of ammunition that doesn't break a 3-D gun when fired. His special Atlas rounds are .314 caliber, a size sometimes used in rifles. However, these rounds look a bit different from normal rounds of ammunition. Typically, there are two mains parts of a round that are usually visible: the bullet, the little pointy part sticking out from one end, and the shell, the casing that surrounds the bullet. In the Atlas rounds, the bullet part doesn't stick out but is instead recessed an inch deep inside the outer metal casing, like a turtle in its shell. Here, the round's thick shell functions as both a barrel and a shell, absorbing the explosive force of the gunpowder and channeling it forward.