The SIG Sauer P365X ROMEO-X is a striker-fired compact 9mm pistol designed for concealed carry. The 3.1" barrel and 18 oz. weight keep it easy to carry, and the 10+1 capacity fits the standard magazine. The slide has an optics-ready cut that ships with the ROMEO-X compact red dot installed, paired with the XRAY3 Day/Night iron sights that remain visible above the optic. 
 

Key Specifications 

• Manufacturer: SIG Sauer 
• Model: P365X ROMEO-X 
• Action: Striker Fired 
• Caliber: 9MM Luger (9x19 Para) 
• Barrel Length: 3.1 inches 
• Capacity: 10+1 rounds 
• Weight: 18 oz (1.125 lbs) 
• Finish: Black Nitron 
• Sights: XRAY3 Day/Night Sights 
   
  The P365X uses the XSeries grip module, which is slightly taller than the base P365 frame for a fuller grip. No manual safety on this configuration - the design relies on the consistent striker-fired trigger pull and holster use for safe carry. The Nitron finish is SIG's standard corrosion-resistant treatment for the slide. The ROMEO-X red dot has a compact footprint that doesn't significantly change the holster profile.

The P365X ROMEO-X gets consistently good reviews for carry use. The compact size, manageable recoil, and factory-installed red dot are the most commonly cited strengths. Owners transitioning from iron sights note a brief adaptation period with the optic but generally find target acquisition faster once adjusted.

The XSeries grip module and straight trigger draw favorable comparisons to the base P365, with most shooters preferring the taller grip for a more complete purchase. The 10+1 capacity is occasionally compared unfavorably to the P365XL's 12+1, but most owners accept the tradeoff for the shorter overall length.

A few users raise questions about the ROMEO-X's battery life and dot size for specific use cases. Reliability across different ammunition is not a common complaint.