Manufactured as a military version of SIG Sauer's commercial P320 line of handguns and adopted in 2017 by the United States Marine Corps, Air Force, and Navy to replace the Beretta M9. Selected for its modular design built around a serialized fire control unit, which allows grip modules to be swapped for different sizes. Still sealed in original blue plastic factory wrapper. The slide is marked "SIG SAUER M18" on the left as well as having the military "MFR: 6ZWB1 PN: 13067088-1" markings above the takedown lever. Fitted with a set of SIG night sights with the rear sight attached to the optics mount cover. The manual safety equipped FCU is fitted with an "M" size grip module. Includes original box with end label marked "SIGP320M18" and two sealed 21 round magazines.