The Sig Sauer P320 X-Series is a striker-fired 9mm semi-automatic pistol with a 3.9-inch barrel and 17+1 capacity. It has an optics-ready slide, a stainless steel construction, and XRAY3 Day/Night adjustable sights, built on a polymer X-grip module for a carry-friendly overall length. The pistol carries the OR (optics ready) designation, meaning the slide is cut to accept a red dot sight without further gunsmithing, and the internal safety system is built into the fire-control unit rather than relying on an external lever. 
 

Key Specifications 

• Brand: Sig Sauer 
• Model: P320 X-Series 
• Caliber: 9mm 
• Capacity: 17+1 
• Barrel Length: 3.9 in 
• Material: Stainless Steel (slide) 
   

Detailed Features 

• Optics-ready slide accepts a red dot sight 
• XRAY3 Day/Night adjustable sights aid target acquisition in low light 
• Polymer X-grip module gives a secure, comfortable hold 
• Internal safety system built into the fire-control design 
• Striker-fired trigger for a consistent pull from shot to shot 
• 17+1 capacity magazine gives a high round count for a compact-length pistol

Owners of the P320 X-Series generally describe the pistol as reliable straight out of the box, with a trigger that feels better than most factory striker-fired pistols. The optics-ready slide is a common draw, since it lets shooters add a red dot without sending the gun out for milling.

For carry and range use, the grip module gets consistent praise for pointing naturally and fitting a wide range of hand sizes. Some owners note the stainless steel slide adds a bit of heft compared to the standard coated models, which a few like for recoil control and others find less ideal for all-day carry.

The P320 platform's modularity is a frequent selling point: grip modules, calibers, and slides can be swapped on the same fire-control unit. Aftermarket holster and sight support is broad, though a handful of owners mention the factory sights are serviceable rather than exceptional and get upgraded early.