SIG Sauer P320 X-Series XFULL Professional 9mm – Agency Vault LE Release, 17+1
This rare X-Series XFULL Professional comes from SIG Sauer’s limited Law Enforcement “Agency Vault” allocation, now released in small numbers to the commercial market. Built on the modular P320 chassis, it delivers full-size control, an optic-cut slide, and factory night sights—making it a standout choice for collectors and shooters who want a duty-grade pistol with modern performance features.
Condition
Overall Condition: As-new condition with no signs of prior handling beyond what’s typical from inspection (see photos).
Bore Condition: Excellent – Clean, mirror finish, no signs of wear.
Rifling: Excellent – Sharp lands and grooves.
What’s Included
- SIG Sauer gray hard carry case
- 3×17-round factory SIG Sauer P320 steel magazines with orange followers
Built for agency contracts, this XFULL Professional features SIG’s stainless-steel slide with forward and rear serrations, finished in durable black Nitron. The slide is cut at the factory to directly accept ROMEO2, ROMEO1PRO, and Leupold DeltaPoint Pro optics, eliminating the need for adapter plates.
The modular Fire Control Unit (FCU) is the serialized component, allowing the owner to swap barrels, slides, and grips while keeping the same legal “firearm.” This flexibility means one chassis can support multiple calibers and sizes if desired.
X-Series ergonomics enhance control through an extended beavertail, deep trigger-guard undercut, and a flat-faced, skeletonized trigger with a crisp break. Combined with the full-size polymer grip module and 17-round magazines, the pistol offers excellent shootability for duty or competition roles.
Tritium 3-dot XRAY night sights provide a bright green front ring for quick daytime alignment and glowing dots for low-light use—ready out of the box with no aftermarket upgrades required.
As part of the Agency Vault run, this pistol ships with three magazines instead of the usual two, adding value for range sessions or duty rotation. Limited civilian availability and LE provenance make it a desirable addition for collectors seeking uncommon P320 variants.