Possibly the greatest submachine gun ever manufactured, the MP5 has become essential to military and law enforcement personnel. Watch WEDNESDAYs at .brRick Harrison from Pawn Stars shows us some of his most unique acqusitions as Gun Stories looks at the strangest guns designed throughout history. See more .brNot only did Mikhail Kalashnikov create what may be the perfect battlefield rifle, his design of the PKM has been in use since 1969 and sets the standard for .brJoin Joe Mantegna as he explores the history behind some of the Worlds most iconic weapons.