The Sig Sauer P320 Full Size Pro is a 9mm semi-automatic pistol with a 4.7-inch barrel and a 17-round capacity. It has polymer grips and a blue/black finish. The pistol ships with X-Ray3 day/night sights. 
 

Key Specifications 

• Brand: Sig Sauer 
• Model: P320 Full Size Pro 
• Caliber: 9mm 
• Action: Semi Auto 
• Capacity: 17 rounds 
• Barrel Length: 4.7 inches 
• Color/Finish: Blue/Black 
   

Detailed Features 

• 4.7-inch barrel with full-size frame 
• 17-round magazine capacity 
• Polymer grip module 
• X-Ray3 front sight with rear night sights 
• Available to LE/MIL/IOP through qualified purchaser programs

Owners of the P320 Full Size Pro consistently point to the trigger and modular design as the reasons they chose it over competitors. The ability to swap grip modules without tools is a genuine advantage for those who share the gun between shooters with different hand sizes. Reliability across a wide range of ammunition is the most repeated positive.

Carry-focused owners note the full-size frame is on the larger end for concealed carry, and most treat this variant as a duty or range gun rather than an everyday carry piece. The 4.7-inch barrel makes it comfortable for extended range sessions, and the X-Ray3 sights are well-regarded for low-light target acquisition.

The P320 platform has a deep aftermarket, which owners appreciate for trigger upgrades, optics mounting, and magazine options. Some buyers flag that the LE/MIL/IOP pricing qualifier limits general retail availability, which is the most common complaint in purchase discussions.