The "Swedish K", produced by the Carl Gustaw company, designated the M45, was a 9mm SMG. It was very popular with Special Operations types in Vietnam, but the Swedish ceased importation of it because they opposed the American invovlement in Vietnam, leading S&W to manufacture the 76, which was a copy, but superior in a few regards.
NRA Life Member
Big Sister: "You should be sponsored by Allen"
Me: "If you can't shoot good, at least look good walking to the firing line."
Big Sister: "Can you not afford a Pelican? Then buy an Allen gun bag."