The Sig Sauer P320 X-Full is a 9mm striker-fired pistol with a 4.7-inch barrel and 17+1 capacity. It comes with a Romeo-RS Pro optic, X-Ray 3 sights, and an X-Grip modular polymer frame in black. Two 17-round magazines are included. 
 

Key Specifications 

• Brand: Sig Sauer 
• Model: P320 X-Full 
• Caliber: 9mm 
• Action: Semi Auto 
• Capacity: 17 rounds 
• Barrel Length: 4.7 in 
• Color/Finish: Black 
   

Detailed Features 

• 4.7-inch barrel with full-size X-Full frame 
• Romeo-RS Pro optic included 
• X-Ray 3 day/night sights 
• Modular X-Grip polymer frame 
• Two 17-round magazines included

The P320 X-Full with the Romeo-RS Pro package is popular with competitive shooters and those who want an optics-ready full-size pistol ready to go without extra purchases. The X-Grip frame is generally well-regarded for feel and modularity.

The Romeo-RS Pro gets mixed feedback. Some owners are happy running it out of the box; others swap it for a different optic within a few months. The X-Ray 3 irons are consistently praised as a quality backup.

At the price point, buyers weigh whether the bundled optic is a value-add or something they'll replace anyway. The P320 platform's reliability and aftermarket depth are rarely questioned, but trigger feel continues to split opinions compared to competitors.