The Sig Sauer P320 Off-Duty Full is a striker-fired, full-size 9mm pistol built on the modular P320 platform, aimed at everyday carry and duty use. It pairs a 4.7-inch barrel with SIG X-Ray 3 night sights and ships with a Romeo-X Enclosed optic mounted on an optic-ready slide, finished in a low-glare Black Nitron coating. 
 

Key Specifications 

• Brand: Sig Sauer 
• Model: P320 Off-Duty Full 
• Caliber: 9mm 
• Action: Semi Auto 
• Capacity: 17+1 Rounds 
• Barrel Length: 4.7 in 
• Finish: Black Nitron 
   

Detailed Features 

• 4.7-inch barrel on the full-size frame gives a longer sight radius for a balanced duty and carry setup 
• Romeo-X Enclosed optic is included and pre-mounted on the optic-ready slide 
• SIG X-Ray 3 night sights serve as a backup aiming reference in low light 
• Modular polymer frame accepts interchangeable X-Grip modules for fit 
• Black Nitron finish gives the slide and frame a durable, low-glare appearance

The full-size P320 has a reputation among owners for running reliably with minimal malfunctions once broken in, and the longer 4.7-inch barrel is often mentioned as giving a steadier sight picture than the compact variants. Some shooters note the factory trigger is serviceable but not exceptional, which pushes a portion of buyers toward an aftermarket trigger.

As a duty-size gun, the P320 Off-Duty Full carries well in a range of holsters, and the modular grip module means the frame can be swapped to match hand size without sending the pistol to a smith. A few owners mention the grip is wide for smaller hands even with the smallest module fitted.

Because the P320 has been adopted widely for duty use, parts and accessories are easy to source, and the enclosed Romeo-X optic is seen as a practical way to get an already-mounted red dot without buying one separately. Owners who want to change optics later appreciate that the slide stays compatible with other footprint options.