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Yes, the SIG Sauer P365 Fire Control Unit (FCU) is designed to be modular and fits all P365 grip frame sizes, including the standard P365, P365X, P365XL, and P365 XMacro, as confirmed by Primary Arms Blog and the official SIG Sauer P365 FCU product page. The FCU is the serialized part, allowing it to be easily moved between different grip modules, enabling quick changes to grip size and magazine capacity.

The Sig P365X accepts standard Sig P365 trigger assemblies and trigger kits. Because the P365X uses the standard Sig Sauer serialized Fire Control Unit (FCU) shared across all P365 variants, any standard P365 trigger, including flat or curved options, will work. Compatibility: The P365 is fully compatible with standard P365X, P365XL, and aftermarket trigger kits. FCU Interchangeability: The core FCU (fire control unit) is the same across the P365 platform, allowing for full interchangeability of internals. Customization: Standard Sig P365 trigger kits, such as those from Grayguns or Sig Sauer factory replacements, fit the P365x or P365xl.