The Sig Sauer P365X is a 9mm striker-fired pistol with a 3.1-inch barrel. It ships with a Romeo-X optics-ready cut and X-Ray 3 sights, and it uses a modified polymer grip module. Listed capacity is 10+1. 
 

Key Specifications 

• Brand: Sig Sauer 
• Model: P365X 
• Caliber: 9mm 
• Action: Semi Auto 
• Capacity: 10+1 
• Barrel Length: 3.1 inches 
• Color/Finish: Black 
   

Detailed Features 

• Striker-fired action 
• Romeo-X optics-ready cut 
• Modified polymer grip module 
• X-Ray 3 sights 
• 3.1-inch barrel

The P365X builds on the P365 platform with an extended grip and wider sight radius, and owners who have shot both generally prefer the X for control during rapid strings. The Romeo-X optics cut is a practical upgrade that the standard P365 lacked.

The 3.1-inch barrel keeps the pistol compact, and most owners carry it without complaint about printing. The 10-round capacity is adequate for carry, though some shooters opt for extended magazines when available.

The polymer grip receives mixed feedback. Some find the texture sufficient as shipped; others add grip tape or swap to aftermarket grip modules. The trigger pull is consistent but not exceptional, and improvement-minded owners often list it as the first swap they make.