The Sig Sauer P365 X-Macro complete frame with Fire Control Unit (FCU) is a factory-assembled pistol frame designed for the P365 series. It incorporates the X-Macro grip module configuration, which provides compatibility with the X-Macro slide and magazine system. The frame houses the serialized FCU, which contains the trigger mechanism and internal components required for operation. This assembly is configured for 9mm P365 platforms and includes the standard polymer grip frame with integrated controls such as the magazine release and slide stop lever. The frame is in new condition. It retains the factory finish and machining consistent with Sig Sauer production standards. The FCU is installed and ready to interface with compatible P365 upper assemblies, providing the modular foundation of the firearm. The X-Macro frame design features an extended grip length compared to the original P365, allowing use of higher-capacity magazines and improved ergonomics. The trigger guard and accessory rail are molded as part of the polymer structure, supporting attachment of lights or other rail-mounted accessories. Included is the complete frame with the installed Sig Sauer FCU. No additional components such as slide assemblies, magazines, or sights are part of this offering. The item represents a fully serialized lower unit suitable for pairing with corresponding P365 X-Macro upper parts and accessories. All components are factory new and assembled to manufacturer specification.