SIG Sauer P320 X-Series Pro “Law Enforcement Vault” 9mm 4.7" Full-Size Pistol
Built for duty and seldom seen outside agency channels, this P320 X-Series Professional comes directly from SIG Sauer’s Law Enforcement Vault allocation. The pistol combines a professional-length 4.7-inch Nitron slide with an XFull grip module, delivering full-size control, modular flexibility, and striker-fired speed in a configuration rarely available to civilian buyers. Factory XRAY3 day/night sights, an optic-ready slide, and a flat-faced skeletonized trigger round out a feature set tailored for serious service use and discerning collectors.
Condition
Overall Condition: As-new condition with no signs of prior handling beyond what’s typical from inspection (see photos). Appears to have been fired only for factory testing.
Bore Condition: Excellent – Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent – Sharp lands and grooves.
What’s Included
- SIG Sauer factory hard case (grey)
- Three 17-round SIG Sauer steel P320 magazines with orange followers
This X-Series Pro was produced in the Agency Vault for police and government contracts, making civilian examples scarce and highly collectible. A serialized modular Fire Control Unit (FCU) allows easy caliber and size conversions, letting owners tailor the pistol to multiple roles without replacing the serialized core.
The stainless-steel barrel mates to a Nitron-finished slide featuring front and rear cocking serrations and a direct optic cut compatible with SIG ROMEO2, ROMEO1PRO, and Leupold DeltaPoint Pro footprints. Fixed XRAY3 tritium sights deliver 24-hour visibility and co-witness with most optics that share these patterns.
The XSeries polymer grip module provides an extended beavertail, deep trigger-guard undercut, and a full-length MIL-STD-1913 accessory rail for lights or lasers. Combined with the flat, skeletonized trigger, the platform promotes a high, consistent grip and a crisp break for rapid, accurate follow-up shots.
With its agency-grade build, modular FCU, and limited civilian availability, this pistol offers both practical performance and collector appeal in an as-new package.