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List of submachine guns - Wikipedia
Submachine gun - Wikipedia
Heckler & Koch MP5 - Wikipedia
Submachine Guns: History & Notable Models - Pew Pew Tactical
Submachine gun | History, Design & Use | Britannica
Ultra-Compact SIG MPX SBR | Reliable and Adaptable Firearm
Unmistakable: The Thompson | An Official Journal Of The NRA
Evolution of the Submachine Gun: Three Distinct Generations
Short End Of The Stick: The Reising Submachine Gun
A Brief History of the Submachine Gun—1915 to Today