SIG P320 Introduction: The U.S. Military’s Modular Revolution

The SIG Sauer P320 (also known as SIG P320 or simply P320) is a revolutionary semi-automatic pistol developed by Swiss/German firearms manufacturer SIG Sauer. The P320 pistol’s defining feature is its fully modular design—unlike traditional pistols, the SIG P320 uses an innovative “Fire Control Unit” (FCU) as the legally defined “firearm,” allowing users to easily swap grips, slides, barrels, and other components, transforming one P320 pistol into multiple configurations.