The Benelli M4 is the civilian version of the M1014 semi-automatic combat shotgun that was developed for the United States military in 1998 and taken into service in 1999. The M4 or the M1014 is now used by military or law enforcement agencies in Austria, Belarus, Belgium, Georgia, Ireland, Libya, Malaysia, Portugal, Serbia, Slovakia, Slovenia, Spain, Ukraine, the United Kingdom, and the United States, among others. Its unique “auto-regulating gas operated” (ARGO) system uses an elegantly simple arrangement of two pistons that push directly against the bolt. The system allows the shotgun to be used with intermixed rounds of different … The post Benelli M4 Tactical Shotgun, by Thomas Christianson appeared first on SurvivalBlog.com.