Sig Sauer P320X FCU 9mm

Updated August 24, 2026

This SIG Sauer P320 X-Series Fire Control Unit is associated with the 9mm P320 platform and presents in very good overall condition. Serial number 58A165171, this serialized component features the distinctive flat-faced X-Series trigger and forms the central operating core of SIG Sauer’s modular P320 handgun system. The lot does not include a complete slide, barrel, grip module, sights, or magazine as described. Unlike many traditional polymer-frame handguns, the P320 places the serialized component within this removable internal assembly, allowing compatible grip modules and upper assemblies to be changed around the same core unit. That modular architecture has become one of the P320’s signature characteristics and gives stand-alone FCUs a special appeal to SIG enthusiasts. This serialized FCU requires an FFL transfer. With its very good condition, flat trigger, and recognizable X-Series configuration, this is a desirable P320 component. Please see photos. Sig Sauer P320X FCU 9mm Semi 58A165171 Very Good

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