The Benelli M4 Super 90 is a semi-automatic shotgun made by the Italian firearms manufacturer Benelli Armi SpA. It is the first gas-operated shotgun made by Benelli as the function is designed around a new method: the “auto regulating gas operated” (ARGO) system. Along with this, it is self-regulating for using cartridges of different lengths and power levels. The M1014 is an M4, but carries a different name to signify military usage only.