The Sig Sauer P320-XTEN is a full-size striker-fired pistol chambered in 10mm Auto. It ships with two 15-round magazines, a 5-inch barrel, and an overall length of 8.5 inches. The frame is polymer, the slide is stainless steel with a black matte finish, and weight comes in at 33 oz (2.1 lbs). 
 

Key Specifications 

• Brand: Sig Sauer 
• Model: P320-XTEN 
• Caliber: 10mm Auto 
• Action Type: Striker Fire 
• Capacity: 15 rounds (2 magazines included) 
• Barrel Length: 5 inches 
• Overall Length: 8.5 inches 
• Weight: 2.1 lbs (33 oz) 
• Finish: Black Matte 
• Frame Material: Polymer 
• Slide Material: Stainless Steel 
   

Detailed Features 

 
X-Ray3 Day/Night Sights come standard, giving usable performance in low light without needing an aftermarket swap. The flat XSeries trigger has a short reset and a clean break, which most shooters notice immediately coming from standard P320 triggers. 
 
The M1913 accessory rail handles lights and lasers directly. The full-size polymer grip module is comfortable for larger hands and keeps the pistol manageable despite the 10mm recoil. The slide is optics-ready, compatible with Romeo2 and RMR footprints. 
 
The 10mm chambering is what draws most buyers to this model. Recoil is real but controllable with practice, and the 15-round capacity is strong for the caliber.

The P320-XTEN gets broadly positive feedback. Owners frequently mention reliable function and solid range performance, and the optics-ready feature is a consistent highlight — buyers appreciate being able to run different red dot sights without a milling job.

The grip and ergonomics are well-regarded. Most users find it comfortable and say the XSeries grip texture gives good control during rapid fire. The trigger pull is generally described as smooth and a step up from older Sig triggers.

Weight is the most common concern, especially among buyers who considered it for carry. Loaded, it is noticeable. Price also comes up — some owners feel the quality justifies the cost, while others find comparable options at lower price points.

Overall, people use it for home defense and sport shooting and report it handling both well. The 10mm power is the main draw, and most buyers seem satisfied with the tradeoff between power, size, and weight.