The Sig Sauer P320 X-Compact RXP is a striker-fired 9mm pistol on the P320 modular platform, in a compact frame with a 3.6-inch barrel. It ships optics-ready with XRAY3 front sights and night sight rear plates. 
 

Key Specifications 

• Model: P320 
• Caliber: 9MM Luger (9X19 Para) 
• Action: Striker Fired 
• Capacity: 10 Rounds 
• Barrel Length: 3.6 inches 
• Weight: 1.58 lbs (25.8 oz) 
• Finish: Black Nitron Stainless Steel 
• Frame Material: Polymer 
   

Detailed Features 

 
The Black Nitron finish on the stainless steel slide holds up well to carry wear and is corrosion resistant. The XRAY3 front sight is Sig's high-visibility tritium/fiber hybrid — it works in daylight and low light without needing to pick a different sight picture. The modular FCU (fire control unit) is the serialized part, so the frame and slide can be swapped to change grip size or barrel length down the road. 
 
At 25.8 oz and a 3.6-inch barrel, the X-Compact is in the middle of the P320 lineup — more grip than a subcompact, shorter slide than the Carry. The polymer frame keeps weight reasonable for everyday carry.

The P320 X-Compact RXP gets consistently positive reviews with a few recurring mild gripes.

Ergonomics and grip comfort are the most common positives. Owners note the P320's grip angle and texture work well for a wide range of hand sizes. Accuracy and reliability are also frequently cited as meeting or exceeding expectations. The XRAY3 sights get specific praise — they're noticeably easier to acquire than standard white-dot sights in dim conditions.

The modular design draws appreciation from owners who want to reconfigure the gun later without buying a whole new firearm. That's a real benefit at this price point.

On the negative side, some concealed carriers find the X-Compact still slightly larger and heavier than they'd prefer for all-day carry. A handful of owners wish the trigger were crisper out of the box. Price also comes up occasionally — it's toward the higher end for compact 9mms, though most owners consider it fair for the quality.

Overall user sentiment is positive. It's a well-made gun with legitimate advantages over budget alternatives, and most owners report no functional complaints.