The Sig Sauer P320 is a full-size modular semi-automatic pistol chambered in 9mm with a 4.7-inch barrel and a 17+1 round capacity. It has a manual safety and a polymer frame in black. The P320 uses a striker-fired action and is offered in an Off Duty configuration. 
 

Key Specifications 

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

Detailed Features 

• 4.7-inch barrel in a full-size frame 
• 17+1 round capacity magazine 
• Manual safety included 
• Striker-fired Semi Auto action 
• Black polymer frame and finish

Owners of the P320 in this full-size 4.7-inch configuration consistently point to the modular chassis system as a practical advantage. The ability to swap grip modules and slides without buying a second firearm is a real draw for those who own multiple P320 variants.

Carry and duty use feedback is generally positive. The 17-round capacity in a manageable frame size makes it a common pick for off-duty carry or home defense. The manual safety on this variant splits opinion: some duty users appreciate it, while others prefer the standard trigger-only configuration.

The P320 trigger gets mixed reviews. Out of the box it is adequate, and the aftermarket for trigger upgrades is large. Build quality complaints are rare, though a small number of owners note that the factory sights are serviceable but not impressive and are often the first thing replaced.