Residents Terrified Over Idea Of Deadly Weapon On Streets WAYNE, N.J. (CBS) ― A large police department in New Jersey is in nail biting mode. It has lost one of the deadliest weapons in its arsenal -- a fully automatic submachine gun, and has no idea where it could be. A 9 mm submachine gun of German design, the MP5 was developed in the 1960s by a group of engineers from the West German arms manufacturer Heckler & Koch. It's used by law enforcement tactical teams across the country, as well as Army Rangers, Delta Force and Navy SEALs, among...