The Spectre M4 SMG is an Italian made gun. It was developed by a company called SITES in the 1980s. It has a quad stack magazine of 9mm with 30 or 50 round capacity depending on the magazine. It has a over folder stock that looks similar to the underfolder on a Sterling MK4.
This gun may look familiar to some of you. The B&T KH9 is based on this design. It is almost a straight up copy.
The B&T KH9 even has the same DA/SA decocking mechanism like the Spectre M4. Sadly they opted for the straight 30rd or 50rd magazines rather than copy the quad stack magazine design of the Spectre M4.