SIG Sauer P320-XTEN 10mm Full-Size XSeries, 5-inch Bull Barrel, Optics-Ready Nitron Slide, 3x 15-Round Mags
The SIG Sauer P320-XTEN is a full-size 10mm built on the modular P320 platform with a 5-inch bull barrel, an optics-ready Nitron-finished stainless-steel slide, and XSeries trigger geometry. This example includes three 15-round factory magazines and a SIG factory hard case, with a case label dated March 20, 2024 and markings of Newington, NH, USA.
Condition
Overall Condition: Good condition, showing some 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: Light handling marks are present on exterior surfaces from prior use. Please review the photos for close-ups of finish marks.
What’s Included
- SIG SAUER factory hard case (gray)
- Three 15-round factory steel magazines
- Misc parts bag
The P320-XTEN delivers 10mm performance in a full-size XSeries configuration with a 5-inch carbon-steel bull barrel and a 15+1 capacity. The flat-faced XSeries trigger with a 90-degree break provides a consistent striker-fired pull.
Its stainless-steel slide wears a Nitron matte black finish and features front and rear serrations plus an optics-ready cut with cover plate. The cut is compatible with SIG ROMEO2 and Trijicon RMR footprints for direct mounting when you choose to add an optic.
Sight setup includes factory-installed iron sights. Controls include ambidextrous slide catch levers and a left-side, push-button magazine release. This model has no external manual safety.
The polymer grip module has aggressive texturing for secure purchase, and the full-length Picatinny accessory rail supports light or laser attachments. It is built on the modular P320 FCU design, marked "NEWINGTON, NH, USA," and carries SIG’s XSeries features in a United States–made configuration. MPN 320X5-10-BXR3-R2; MSRP is $899.00.