Sig Sauer P320 Carry 9mm — M18 FCU Build with Wilson Combat Grip and Holosun SCS 320-GR, 3.9 in Barrel, 17+1, 2 Mags
This customized Sig Sauer P320 is built on an M18-serialized FCU and configured in the P320 Carry format, pairing a 3.9 inch compact-length slide with a full-size grip. It features a Wilson Combat P320 grip module for enhanced ergonomics and an installed Holosun SCS 320-GR green-dot optic that direct-mounts to the P320/DPP footprint. Ambidextrous slide catch levers, an accessory rail, and an optics-cut slide round out a practical, carry-size setup with 17+1 capacity and two included 17-round magazines.
The Wilson Combat grip module provides an extended beavertail, aggressive texturing, and an undercut trigger guard for a secure purchase. The factory optics-cut slide has front and rear serrations and is paired with a front post featuring a green-dot insert; the rear notch is integrated into the optic housing for a clean sight picture.
The Holosun SCS 320-GR brings a green reticle, solar charging, and a low-profile, direct-mount fit tailored to the P320/DPP footprint. The optic is clear and clean, with only minor exterior marks noted.
This striker-fired P320 build does not have an external manual safety. It retains the M18 FCU foundation while adopting a compact-length slide with a Carry-length grip and practical enhancements aimed at confident handling and fast sight acquisition.
Condition
Overall Condition: Fair condition, showing extensive signs of prior use and handling.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: The pistol is in solid shape with scratches and blemishes present. There is pitting within the slide serrations, and the magwell shows blemishes. Magazines fit tightly in the frame. The optic glass is clear and clean with minor exterior scratches and blemishes. The optic was installed using red Loctite and will be very difficult to remove.
What’s Included
- SIG Sauer factory hard case
- SIG Sauer manual and documentation
- Holosun SCS 320-GR optic (installed; green reticle; solar charging; direct-mount for P320/DPP footprint; integral rear notch)
- Wilson Combat P320 grip module (installed)
- 2x 17-round P320 steel magazines with tan polymer baseplates (one marked "Made in Italy")
This pistol was built on an M18-serialized P320 FCU with a compact 3.9 inch slide, a Carry-length grip module, an optics-cut configuration, and an accessory rail on the dustcover. It includes ambidextrous slide catch levers and no external manual safety. The Holosun SCS 320-GR offers a direct-mount, low-profile solution that pairs with the front green-dot post and its integral rear notch for a straightforward sighting setup. The Wilson Combat grip module contributes confident control through its aggressive texturing, extended beavertail, and undercut trigger guard.