Strange guns in my neighborhood

One of my neighbors carries the Intratec TEC DC-9

The TEC DC-9 is a low priced autoloading pistol made by Intratec Firearms of Miami, Florida. The DC-9 looks like a miniature submachinegun, although it is not a fully automatic firearm. The magazine is located in front of the trigger, and the gun features a threaded barrel, a perforated heat shroud, and a long 30-round magazine. The DC-9 is blowback operated and chambers the 9mm Luger cartridge ( 9×19mm ).

DC-9 is over a foot in length and weighs in at over four and a half pounds when loaded.

My neighbor wears it slung over his shoulder like a full auto SMG.