The Sig Sauer P320 M18 complete frame with fire control unit (FCU) is a factory-configured component designed for the modular P320 pistol platform. This assembly includes the serialized FCU housed within the M18 grip module, forming the central operating portion of the firearm. The M18 frame is sized for the compact variant of the P320 series and serves as the foundation for compatible slide and barrel assemblies in 9mm or other supported calibers. The design incorporates the standard P320 trigger mechanism and internal safety features as part of Sig Sauer’s striker-fired system.
The grip module of the M18 frame follows the compact military configuration used in the service model, featuring integrated texturing and ergonomic contours for controlled handling. The FCU is constructed from precision-machined metal components and contains the trigger, sear, and striker assembly interfaces. The frame provides full compatibility with Sig’s modular slide assemblies and magazines within the M18/P320 family, allowing configuration flexibility without altering the serialized component.
Included is the complete frame assembly with the installed fire control unit. No additional parts, slides, or accessories are listed beyond the assembled frame and FCU. The item represents the core functional unit of the Sig P320 M18 system, suitable for integration with matching upper assemblies and grip components from the same series.
Size M Module
