SIG SAUER P365 Fire Control Unit – Modular Core of the P365 Platform

The SIG SAUER P365 Fire Control Unit (FCU) is the serialized core component of the P365 system, designed to give users maximum flexibility in building or customizing their pistol. As part of SIG’s modular design philosophy, the FCU allows you to swap frames, slides, and calibers while retaining the same serialized unit.

Engineered under SIG Custom Works, this FCU features a skeletonized flat-blade trigger, offering a clean break and improved trigger feel compared to standard curved designs. Its compact and lightweight construction—shipping at just 0.6 lbs.—makes it easy to integrate into various P365 configurations.

Compatible with both 9mm and .380 ACP P365 platforms, the FCU serves as the foundation for building everything from ultra-compact carry pistols to larger X/XL or Macro-style setups.

Finished in black, it maintains durability while blending seamlessly into any build. This unit is also California roster compliant, making it accessible in more restrictive markets.

Key Features:

Manufacturer: SIG SAUER
Model: P365 Fire Control Unit
Series: P365 Series
Type: Fire Control Unit (Serialized Component)
Caliber Compatibility: 9mm / .380 ACP
Finish: Black
Trigger: Skeletonized Flat Blade
Weight (Shipping): 0.6 lbs.
Additional Info: SIG Custom Works Component
MFG Part #: 8900165
UPC: 798681626007

A perfect option for those looking to build, customize, or upgrade a P365 platform, offering unmatched modularity and control over your pistol setup.

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