Firearms used or carried during and in relation to a crime of violence or drug trafficking crime refer to any type of weapon that is capable of being fired or discharged in order to cause death or serious bodily injury. This includes handguns, rifles, shotguns, machine guns, and any other type of firearm. The use or carrying of a firearm during and in relation to a crime of violence or drug trafficking crime is an act that is punishable by law and can result in significant prison time and fines. The types of firearms used in such crimes are often illegal and can include semi-automatic weapons, assault weapons, sawed-off shotguns, and automatic weapons. In addition, individuals involved in such crimes may conceal their firearms in order to avoid detection.