The SIG Sauer P250 is a semi-automatic pistol made by SIG Sauer of Exeter, New Hampshire. Like other SIG-Sauer pistols, the P250 pistol is a short recoil operated, locked breech pistol. It uses the typical SIG-Sauer cam-operated barrel, which locks into the ejection port on the slide.
A key feature of the pistol is its modular design. The main module of the P250 is an internal stainless steel frame fire control unit which consist of the integrated fire control group, ambidextrous slide release, ejector and four slide rails. This steel receiver unit is used in every P250 grip module and is inserted into the grip frame module and held in place by the axis pin of the disassembly lever. The firearm's serial number is on the fire control unit instead of the grip module. The fire control unit allows the operator to interchange different-sized slide assembly and caliber configurations to adapt the gun to the individual user and address different needs.