The Sig Sauer P320 Pro is a full-size semi-automatic pistol chambered in 9mm with a 4.7-inch barrel and a 17-round capacity. It ships with the Romeo-X red dot optic and X-Ray 3 night sights. The Pro model carries a black finish. 
 

Key Specifications 

• Brand: Sig Sauer 
• Model: P320 Pro 
• Caliber: 9mm 
• Action: Semi Auto 
• Capacity: 17+1 
• Barrel Length: 4.7 in 
• Color/Finish: Black 
   

Detailed Features 

• 4.7-inch barrel 
• 17-round magazine capacity 
• Romeo-X red dot optic included 
• X-Ray 3 day/night sights 
• Black finish

Owners of the P320 Pro consistently point to the Romeo-X optic integration as the main draw. Having the red dot already zeroed and co-witnessed with the X-Ray 3 sights out of the box saves setup time, and the pistol's fit with aftermarket holsters designed for standard P320 frames is straightforward.

The P320 platform's trigger gets mixed feedback. Many owners are satisfied with the stock pull, but some swap the trigger components early for a lighter or shorter reset. The Pro's slightly longer 4.7-inch barrel is preferred by range shooters for velocity and sight radius, though it makes concealed carry a secondary role.

For value, opinions vary. Buyers who want the Romeo-X and night sights view the bundle as worthwhile compared to purchasing the components separately. Others feel the street price of the Pro model is a premium over what the added hardware justifies, and they'd prefer choosing their own optic.