Sig Sauer P320X FCU 9mm

Updated August 24, 2026

This SIG Sauer P320 X-Series Fire Control Unit, or FCU, is marked for the P320 platform and associated with 9mm configurations. Serial number 58A165480, this serialized component presents in very good overall condition and features the desirable flat-faced X-Series trigger. Unlike a conventional complete pistol, the P320’s serialized fire-control assembly forms the heart of SIG Sauer’s modular handgun system and can be installed into compatible grip modules and paired with appropriate slide, barrel, and magazine assemblies. No barrel, slide, grip frame, sights, or magazine are included with this lot as described. The P320’s modular FCU concept is one of the features that helped make the platform so distinctive in the modern handgun market, allowing a single serialized unit to serve as the foundation for numerous configurations. This FCU requires an FFL transfer. A desirable foundation for the SIG Sauer P320 enthusiast. Please see photos. Sig Sauer P320X FCU 9mm Semi 58A165480 Very Good

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