The Sig Sauer P320 XTEN is a semi-automatic pistol chambered in 10mm with a 5-inch barrel and a 10-round capacity. It has an optic-ready slide cut, factory-installed night sights, and a black polymer grip module as part of the X-Series configuration. 
 

Key Specifications 

• Brand: Sig Sauer 
• Model: P320 XTEN 
• Caliber: 10mm 
• Action: Semi Auto 
• Capacity: 10+1 
• Barrel Length: 5 in 
• Color/Finish: Black 
   

Detailed Features 

• 5-inch barrel in the X-Series platform 
• Optic-ready slide cut for direct-mount optics 
• Night sights installed from the factory 
• Polymer grip module in black 
• 10-round magazine capacity

Owners of the P320 XTEN tend to appreciate getting 10mm in a modular P320 chassis, noting that the X-Series frame and 5-inch barrel keep the pistol controllable for a powerful cartridge. The optic-ready cut and factory night sights are common points of satisfaction, with many skipping any additional sight work out of the box.

The XTEN draws constant comparison to other P320 variants, which cuts both ways. Controls and manual of arms are identical to the 9mm P320, so existing Sig owners adapt quickly. The common complaint is the 10-round magazine, which some find limiting given what the 10mm cartridge is meant to accomplish.

The pistol sits in a specific niche: polymer-framed, striker-fired 10mm in a duty-size format. Some buyers are exactly the audience for that combination; others feel the 10mm round fits better in a metal-frame gun. Trigger feel is consistent with the standard P320 and draws the same split opinions that platform always generates.