The Sig Sauer P320 Pro RXP Full Size is a striker-fired 9mm pistol built with a 4.7-inch barrel and a 17-round capacity. It ships with a ROMEO1PRO red dot pre-installed and XRAY3 suppressor-height sights that co-witness through the optic window, plus a factory threaded barrel for muzzle devices. 
 

Key Specifications 

• Brand: Sig Sauer 
• Model: P320 Pro RXP 
• Caliber: 9mm 
• Action: Striker-fired, semi-automatic 
• Capacity: 17 rounds 
• Barrel Length: 4.7 inches 
• Grip Module: Black XSeries polymer 
   

Detailed Features 

• Pre-installed ROMEO1PRO red dot with XRAY3 suppressor-height iron sights for co-witness aiming 
• Factory threaded barrel accepts suppressors and other muzzle devices 
• Black XSeries polymer grip module shaped for a secure hold 
• Full-size 4.7-inch barrel and 17-round capacity magazines 
• Striker-fired action for a consistent trigger pull shot to shot

Owners of the P320 Pro RXP tend to like having a red dot pre-installed at the factory instead of sending the slide out for milling, since it removes a step and a cost that full-size striker pistols usually require separately. The XRAY3 suppressor-height sights getting a proper co-witness through the optic window is called out often as a detail that a lot of other factory-optic pistols miss.

Handling the full-size grip and barrel feels familiar to anyone who has run a P320 before, and the XSeries grip module gets generally positive marks for its texture and hand fill. The threaded barrel is a plus for owners planning to run a suppressor or compensator without buying an aftermarket barrel.

On reliability, striker-fired P320 pistols have built a solid track record in duty and range use, and this variant carries that reputation forward. A few owners mention the factory red dot means you're committed to whatever footprint it uses unless you later swap the slide, which is worth knowing going in.