The modular SIG MPX Carbine maintains the ergonomic superiority of the short-barrel rifle and pistol variants, but with a 16" barrel. Completely ambidextrous, the SIG MPX Carbine is great for left- or right-handed shooters with its dual-sided selector switch, magazine release, charging handle and bolt release. The SIG MPX operates from a fully-closed and locked rotating bolt, offering enhanced reliability and safety in use. A short-stroke gas piston allows the SIG MPX to run all weights and brands of 9mm ammunition with no adjustments to the gas valve. A full-length picatinny rail allows for solid, consistent mounting of optics and targeting lasers. SIG SAUER folding iron sights come standard.