Sig Sauer P320X FCU 9mm

Updated August 24, 2026

This SIG Sauer P320 X-Series Fire Control Unit is marked for the modular P320 platform and associated with 9mm configurations. Serial number 58C337347, this serialized FCU presents in very good overall condition and features a desirable flat-faced X-Series trigger. The unit serves as the serialized core of the P320 system and is designed to interface with compatible grip modules, slides, barrels, and other appropriate components. No complete frame, slide, barrel, sights, or magazine are included with this lot as described. SIG Sauer’s modular fire-control-unit concept helped distinguish the P320 from conventional polymer-frame pistols by placing the serialized portion within the removable internal chassis rather than permanently in the grip module. This flexibility has made the platform especially popular with enthusiasts who appreciate multiple configurations built around one serialized core. FFL transfer is required for this FCU. Please see photos. Sig Sauer P320X FCU 9mm Semi 58C337347 Very Good

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