SIG Sauer P320 Custom Works FCU 9mm — ZEV optics-cut slide, 4.25 in threaded barrel with compensator, X-Series full-size gray grip, 21+1
This Custom Works FCU-based P320 is a full-size 9mm modular build that mirrors the configuration of a P320 Spectre Comp. Instead of a factory-comped SIG upper, it uses a comped ZEV upper of similar layout. The package combines a ZEV-marked slide with an installed screw-on compensator, a SIG X-Series full-size gray grip module with an aluminum flared magwell, and a gold skeletonized flat trigger shoe, delivering a distinctive, purpose-built configuration.
The ZEV slide features an optics cut with a cover plate installed, forward and rear serrations, and lightening windows. The 4.25 in threaded barrel is marked 1/2-28 and pairs with a screw-on compensator that has top and side ports and is secured by a set screw. The slide is ZEV-marked and noted as Centralia, WA.
The SIG X-Series full-size gray grip module has an aggressive texture and an installed flared aluminum magwell. A 5-slot 1913 accessory rail is molded into the dustcover. The frame is molded with the marking NEWINGTON, NH, USA, and this Custom Works FCU configuration is identified by manufacturer part number 8900160 and country of origin USA.
The pistol is striker-fired and configured for 21+1 capacity. It includes one steel SIG P320 magazine fitted with a Taran Tactical Innovations extended aluminum base pad; the magazine body is marked "MADE IN ITALY." No iron sights are present on this build.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: Minor superficial scratches and small blemishes are present. No iron sights are installed. Carbon buildup is present in the compensator.
What’s Included
- SIG Sauer P320 Custom Works FCU box (item 8900160)
- ZEV P320 optics-cut slide with cover plate installed
- Thread-on compensator with top and side ports, set-screw retained (installed)
- SIG Sauer X-Series full-size gray grip module with flared aluminum magwell (installed)
- Gold skeletonized flat trigger shoe (installed)
- 1x 21-round steel SIG P320 magazine with Taran Tactical Innovations aluminum extended base pad (magazine body marked "MADE IN ITALY")