The SIG Sauer MPX is a gas operated semi-automatic pistol (or submachine gun for military and law enforcement). It’s very compact and utilizes a closed, rotating bolt that is actually rare in submachine guns but is intended to make the weapon more reliable. The MPX was unveiled in 2015, and later led to the release of the MCX as well.
SIG Sauer MPX (7/22)
Submitted to "Greatest SIG Sauer Guns of all Time"