Sig P320 FCU Explained: The Core of Modular Handgun Builds
The Sig P320 Fire Control Unit (FCU) is what sets the platform apart from traditional handgun designs. It is the serialized core that allows complete modularity.
What Is the FCU?
The FCU is the serialized portion of the firearm, containing the trigger group and firing mechanism.
- Legally considered the firearm
- Can be transferred between configurations
- Enables full modularity
Why It Matters
With one FCU, you can build multiple setups:
- Compact carry
- Full-size duty
- Competition builds
Compatibility
The FCU works across all P320 configurations when paired correctly with slides and grip modules.
Upgrade Options
- Custom grip modules
- Slide upgrades
- Trigger enhancements
Cross Platform Comparison
Unlike Glock, where the frame is serialized, the P320 offers flexibility unmatched by most platforms.
Explore alternatives like Glock builds or Walther PDP.
Why Choose TCM Stock
- Trusted OEM supplier
- Accurate listings
- Fast fulfillment
Start your modular build today.
