Missiles play an important role in modern armaments . Missiles are self-propelled systems. The missile consists of four parts: targeting or guidance , flight system , engine and OR head. In some cases, specially designed missiles are used for a variety of purposes , such as: surface-to-surface and surface-to-surface , sky- to-sky , sky-to-surface or anti-satellite missiles. Examples: FGM-146 Javelin , Mim-104 Patriot , Arrow Missile. A firearm is a type of weapon that is capable of launching one or more missiles very quickly through a controlled explosion. There are different types of firearms Notable among these are: AK -47 , M1911 , M16 rifle , grenade , Glock 19 etc.