The Sig Sauer P320 9/40/357 Custom Works Fire Control Unit w/Skeletonized Gold Trigger Blade 8900160 is a premium component designed for building a custom P320 pistol. This fire control unit features an exclusive titanium nitride frame and a skeletonized gold trigger blade, providing a smooth and crisp trigger pull. The FCU is compatible with all 9mm, .357 SIG, and .40 S& W P320 post-upgrade accessories, allowing for endless customization options. Each unit comes with a custom serial number starting with "FCU," making it a unique and personalized addition to your firearm collection. Sig Sauer P320 9/40/357 Custom Works Fire Control Unit w/Skeletonized Gold Trigger Blade 8900160