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Sig Sauer

Sig 320 Custom Works Fire Control Unit Titanium Nitride Coated Skeletonized Trigger Gold, 8900160

Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.

Serialized Item

Requiring transfer to an FFL

Exclusive Titanium

Nitride frame

Titanium Nitride

Skeletonized trigger

Custom "Fcu######"

Serial number

Compatible 9mm,

9mm, .357 SIG, and .40

$349.99
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SKU: 8900160-798681633319

Overview

Built for shooters who want a configurable foundation for a P320 setup, this serialized fire control unit is intended for use with compatible post-upgrade accessories in 9mm, .357 SIG, and .40 S&W. It features an exclusive titanium nitride frame and a titanium nitride skeletonized trigger, giving the unit a distinctive custom appearance. The custom “FCU######” serial number marks it as a serialized component that must be transferred through an FFL. For hunters and range users assembling a compatible sidearm platform, it serves as the core component around which the rest of the system is built.

Why Hunters Choose the Sig Sauer

Serialized Item

Requiring transfer to an FFL

Exclusive Titanium

Nitride frame for a distinctive

Titanium Nitride

Skeletonized trigger included

Custom "Fcu######"

Serial number adds a unique

Compatible All

All 9mm, .357 SIG, and

Key Features

  • Serialized item requiring transfer to an FFL.
  • Exclusive Titanium Nitride frame.
  • Titanium Nitride skeletonized trigger.
  • Custom "FCU######" serial number.
  • Compatible with 9mm, .357 SIG, and .40 S&W P320 post-upgrade accessories.

Best Used For

  • P320 owners seeking a serialized Custom Works fire control unit for a compatible upgrade build
  • Shooters wanting a titanium nitride-coated FCU with a skeletonized trigger and custom serial number
  • Users planning a 9mm, .357 SIG, or .40 S&W P320 post-upgrade accessory setup
  • Buyers who need an FFL transfer item for a serialized firearm component

Specifications

Caliber9mm/357SIG/40SW
Compatibilityall 9mm/357SIG/40SW P320 post-upgrade accessories
Custom Serial NumberFCU######
Exclusive Titanium Nitride FrameYes
Ffl Transfer RequiredYes
Serialized ItemYes
Titanium Nitride Skeletonized TriggerYes

Pros

  • Serialized item requiring transfer to an FFL.
  • Exclusive titanium nitride frame for a distinctive Custom Works finish.
  • Titanium nitride skeletonized trigger included.
  • Custom "FCU######" serial number adds a unique identifier.
  • Compatible with all 9mm, .357 SIG, and .40 S&W P320 post-upgrade accessories.

Considerations & Trade-offs

  • This is a serialized item and requires transfer to an FFL, so purchase and delivery involve additional steps beyond a standard accessory order.
  • Compatibility is limited to P320 post-upgrade accessories and the listed 9mm, .357 SIG, and .40 S&W platforms, so it is not a universal fit.
  • The titanium nitride frame and skeletonized trigger are specific design choices that may appeal to some users but are not necessary for every build.
  • As a fire control unit, this is a component purchase rather than a complete firearm, so additional parts are required for a finished setup.

Suggested Comparisons

  • Pistol fire control units
  • Pistol frame assemblies
  • Pistol upgrade components
  • Serialized firearm parts

Suggested Accessories

  • FFL transfer services
  • Pistol grip module
  • Pistol slide assembly
  • Pistol magazine

Frequently Asked Questions

Is this Fire Control Unit serialized and does it require an FFL transfer?

Yes. The product description states that it is a serialized item and will require transfer to an FFL.

What P320 models or calibers is this FCU compatible with?

It is listed as compatible with all 9mm, .357 SIG, and .40 S&W P320 post-upgrade accessories.

What special features are listed for this FCU?

The listed features are an exclusive Titanium Nitride frame, a Titanium Nitride skeletonized trigger, and a custom "FCU######" serial number.

Does the product description include barrel, slide, or grip module specifications?

No. Those specifications are not provided in the source data.

Is this a complete pistol or just the fire control unit?

The product is identified as a Sig 320 Custom Works Fire Control Unit, so the source data describes the FCU rather than a complete pistol.