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The Sig Sauer P365 Custom Works FCU in Gold Nitride is the serialized heart of your next custom build. This is the component that houses all the critical firing mechanisms—trigger, sear, firing pin, springs, and safety lever—that make your pistol function. It's what the ATF considers the actual firearm, which means once you have this FCU, you can assemble the rest of your P365 however you want.
What makes this unit stand out is the finishing and engineering. It features a titanium nitride coating in gold that not only looks premium but resists wear far better than standard finishes. The skeletonized flat-face trigger is crisp and consistent, giving you a clean break without unnecessary weight or bulk. Everything comes fully assembled and ready to drop into a grip module.
This FCU is compatible with all P365 platform grip sizes, including the standard P365, P365X, P365XL, and P365 X-Macro. You can mix and match slides, barrels, optics, and magazines from the entire P365 ecosystem. Want a compact setup for everyday carry? Pair it with a P365 grip and slide. Need something with more capacity? Build it into an XL frame and add 15-round magazines. The modularity means you can even swap things around later without any legal complications—once you own the serialized FCU, moving it between compatible frames is straightforward.
The gold nitride finish does more than look sharp. This titanium nitride coating provides enhanced surface durability and corrosion resistance compared to standard finishes. The frame material is stainless steel, and tungsten-infused internals in the fire control components resist wear to keep everything running smoothly through years of use. Whether you're building a carry gun or a range toy, this foundation is engineered for reliable performance.
Yes. The FCU is the same across all P365 variants. You can move this fire control unit between standard P365, P365X, P365XL, and P365 X-Macro grip modules without any issues. The slides and barrels are also interchangeable across these sizes, giving you complete flexibility to build exactly the configuration you want.
You'll need a grip module, a slide, a barrel, and magazines. All of these are available from Sig Sauer or aftermarket manufacturers. The grip module houses the FCU and gives you the controls you actually grip. The slide and barrel handle the actual shooting. This FCU handles all the firing mechanics—you're just adding the external components around it.
This particular unit comes without a thumb safety, but the P365 platform is compatible with manual safety kits. You would need to purchase a separate manual safety assembly and potentially modify your grip module to accept it. Not all grip modules come pre-drilled for manual safety installation.
Starting with an FCU lets you build the exact gun you want from the ground up rather than buying a complete pistol and swapping parts. You choose every component—grip size, slide length, sight type, barrel length—instead of compromising with what's in stock. Plus, the gold nitride finish and custom works engineering give you a premium foundation that's typically only found on higher-end builds.
| UPC | 798681659548 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 8900164 |
| Action | |
| ATF Type | FRAME |
| Caliber/Gauge | 9mm |
| Color | Gold |
| Model | |
| Package Height | 2.0 |
| Package Width | 4.7 |
| Product Type | Striker Fired |
| Safety | No Thumb Safety |
| Shipping Weight | 0.5 |
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