A firearm is a type of a gun usually portable, whose action of launching one or more projectiles is defined by an explosive. Firearms Elgin were first introduced in the Asian continent in China, and later on spread to other continents like Europe. Initially, the projectiles in use were scrap metal, broken porcelain and arrows. On the other hand, their propellants used to be black powder. However, as the technology spread across Asia and towards Europe, the propellants in use became smokeless powder. Firearms also exist in different types: handguns for instance are the smallest types of guns, which also exist in the forms of single shot pistols, revolvers and semi automatic pistols.