Brügger & Thomet, who are best know for the B&T MP9 Submachine gun and TP9 Pistol, have developed a new 9mm submachine gun called the B&T APC9. This UZI-sized gun is very lightweight, fully ambidextrous, has quad rails and take MP9/TP9 magazines. B&T are marketing is as a package, with stocks, accessories and suppressors.
With submachine guns being replaced in the USA by carbines, and with PDW-style guns in Europe, I am pleased to see the classic 9mm sub-gun is not yet dead.
[ Many thanks to Aurelien for providing the info and photos. ]