[oflannabhra]

For anyone wanting a quick breakdown of the current situation: the Sig Sauer P320 is a striker-fired handgun, which means the firing pin is spring loaded and retained by a sear. Other handguns are hammer-fired, where the trigger (or slide actuation) cocks the hammer. Other popular striker-fired guns include the Glock and Smith and Wesson M&P series. Frequently, striker-fired pistols come without safeties, but optionally add them.

The P320 was popular as it was designed as a modular system, allowing a single FCU (firing control unit, basically a trigger and striker assembly) to be independent and swappable with other parts of the handgun: grip, slide, barrel, etc. This allows for a single platform to serve multiple needs: concealed carry, compact, full-size, or even competition models, as well as be transferrable across calibers. The magazine design also allowed for more rounds to be carried in compact configurations.

The P320 was selected by the US Army [0] as the official replacement for the Beretta M9 as a service-issued sidearm, officially designated the M17 or M18 (in 9mm).

In 2020 SIG SAUER initiated a "voluntary upgrade program" [1] that swapped various components of the trigger to prevent unintended discharge (UD) events that could occur when the pistol dropped in certain orientations. These changes became standard for the M17 and all P320 manufactured after.

Recently, there have been very high-profile cases and investigations around UD events, the most recent being by an event in the Air Force that led to the death of an airman. In that case the Air Force put a suspension on the firearm during the investigation but eventually arrested the airman responsible, as they determined he had lied about the events [2].

Regardless of the specific failure modes of the weapon, there is a stigma around it, resulting in various law enforcement agencies switching from it or ranges banning the firearm. This has been popularized by incidents caught on video and somewhat viral videos of testing the firearm in a variety of scenarios.

All in all, the P320 is one of the most mass-produced firearms in the world, and I would not be surprised to see Sig Sauer continue to fight in the court of public opinion to defend the reputation of the firearm, in what I would deem a losing strategy.

[0] - https://en.wikipedia.org/wiki/SIG_Sauer_M17

[1] - https://www.sigsauer.com/p320-voluntary-upgrade-program

[2] - https://www.airforcetimes.com/news/your-air-force/2025/08/08...