Moving the M-4 Shuriken into the pistol slot

Seeing as the M-4 Shuriken is describe to be a Machine pistol, it has always baffled me to fine it in the submachine gun slot. The design is very similar to how a pistol looks in the Mass Effect Universe and it’s a burst-fire weapon. It has always effected the immersion for me. All the other submachine guns look & follow a certain look, then there’s the M-4 Shuriken looking like a pistol.