Sig Sauer P320 Custom Works Fire Control Unit

This is the serialized part of a P320: the Custom Works fire control unit. On the P320 the FCU is the firearm. The grip module, slide, barrel and magazines are all accessories that drop onto it, which is what lets one P320 become a full size, carry or compact gun in a few minutes. This one is sold on its own, ready for your choice of parts.

The Custom Works FCU has an exclusive titanium nitride treated frame in black and a titanium nitride skeletonized flat face trigger. It carries a custom FCU serial number prefix. It works with all 9mm, 357 SIG and 40 S&W P320 post upgrade accessories, so the slide and barrel you pair with it decide the caliber. It is striker fired with no thumb safety. Pick a grip module size, add a slide assembly and magazines, and you have a P320 built the way you want it.