“The next generation of submachine gun is here,” states a SIG Sauer video demonstrating the all new SIG MPX. Â The SIG MPX is a new submachine gun that the company is expected to show off at next week’s SHOT Show.
There are a number of features that really set this gun apart from others in this category. Â First, according to the video, the SIG MPX is the world’s first submachine gun to work with a fully closed and locked rotating bolt system. Â The gun uses the SIG Sauer short stroke gas piston system that the company has used on their other rifles. Â There is a last round hold open.