The fact the Army was looking for an SMG, or submachine gun, was big news a couple of years ago. They hadn’t adopted a submachine gun platform for “big Army” since the M3 Grease gun from World War 2.
Then, seemingly out of nowhere, the Army put out a request for samples for modern submachine guns with a rather strict requirement. The Army wanted a very small SMG, and their newest effort to field one would be called the Sub Compact Weapon system. As we know now, the winner would be B&T’s APC9K.