Sig Sauer P320 Custom Works FCU – Gold Nitride

This is a Sig Sauer P320 Custom Works Fire Control Unit (FCU) finished in Gold Nitride. It is an FCU-only (ATF-classified frame) component designed to fit Sig P320 platforms and to accept post-upgrade P320 parts and accessories. The unit features a titanium nitride finish and a flat, skeletonized trigger profile for a refined interface.

Key Specifications

• The product is a Fire Control Unit with ATF Type classified as FRAME.
• Compatible calibers are listed as 9mm / .40 S&W / .357 SIG.
• The exterior finish is Gold Nitride.
• The frame material/appearance is described as Titanium Nitride.
• The trigger is a flat, skeletonized flat blade design.
• The unit is specified to fit Sig P320 platforms and compatible parts.
• The action type is listed as Semi-Auto (Striker-Fired).
• The safety configuration is No Thumb Safety.
• The listed weight (package/shipping) is 0.7.

This Custom Works FCU provides an OEM-fit component-level upgrade for P320 owners who want a refined finish and a reduced-profile trigger interface while retaining compatibility with P320 post-upgrade parts. Its Gold Nitride finish and skeletonized trigger deliver a premium appearance and installer-friendly fit for builders and shooters focused on component quality and long-term durability.