t’s no secret that pistol-caliber carbines are an excellent choice for home defense or as “truck guns.” In that class, there are a couple of great options available — with the SIG MPX being a Cadillac offering. The original 8-inch-barreled version was intended to fill the samesize envelope as the much-vaunted HK MP5 with a modern gas system, AR-style controls, and modularity at both ends with M-LOK handguard and Picatinny rail endcap. With all this in mind, we wanted to dedicate an column to setting up our version of the ideal home-defense-oriented MPX carbine. We
