P220P320

P220P320 is not an official model designation from SIG Sauer. It is a term that appears in some online discussions to refer to either a comparison between the two pistol families—the hammer-fired P220 and the modular striker-fired P320—or to a hypothetical hybrid concept, rather than a production firearm.

The P220 is a traditional double-action/single-action pistol that originated in the 1970s. It has historically been chambered for calibers such as .45 ACP, with later variants offered in 9×19mm and other cartridges. The P220 typically features a fixed or traditional hammer, limited modularity, and a steel or alloy frame in many versions, producing a different balance and trigger feel compared with modern polymer-framed pistols.

The P320, introduced in the 2010s, is SIG Sauer's modular, striker-fired pistol. It uses a serialized internal chassis and interchangeable grip modules, allowing users to change frame size and calibers with relative ease. Common calibers include 9mm, .40 S&W, and .45 ACP. The P320 offers different trigger, grip and sight options, and has been adopted by military and law enforcement agencies in various variants (including the M17 and M18).

In discussions about P220P320, enthusiasts may explore topics such as cross-compatibility of components, magazine capacities, or the comparative ergonomics and maintenance of hammer-fired versus striker-fired designs. However, no factory P220P320 exists, and part interchangeability between P220 and P320 platforms is limited and generally not recommended for actual service use.

See also: SIG Sauer P220; SIG Sauer P320; M17/M18.