This Sig Sauer P365X ships chambered in 9mm Luger with a 3.7-inch barrel, a polymer grip frame, and a Romeo-X reflex optic mounted on its optic-ready slide. Sig's X-Ray 3 sights sit underneath the optic as a backup, and the pistol holds 21 rounds. The compact package targets shooters who want a red dot ready for concealed carry out of the box. 
 

Key Specifications 

• Brand: Sig Sauer 
• Model: P365X 
• Caliber: 9mm Luger 
• Action: Semi Auto 
• Capacity: 21 
• Barrel Length: 3.7 in 
• Material: Polymer 
   

Detailed Features 

• Romeo-X reflex optic ships mounted on the optic-ready slide 
• X-Ray 3 sights give a co-witness backup for the optic 
• Striker-fired trigger breaks with a consistent, single-action-style pull 
• Polymer grip frame keeps the pistol light for daily carry 
• 3.7-inch barrel keeps the overall package compact for a 21-round 9mm Luger carry pistol 
• SIG designation on this build is the P365X frame paired with the Romeo-X optic package

Owners of the P365X generally find it reliable once broken in, and the compact size doesn't seem to hurt its ability to run a range of 9mm Luger ammunition. A common complaint is that a factory-mounted optic like the Romeo-X sometimes needs re-zeroing after a lot of carry use.

The P365X's grip is a common talking point: most shooters like how it conceals for a gun this size, though a few larger-handed owners wish the grip module were longer. The optic-ready slide is popular for a red-dot equipped carry gun without a separate milling job.

Aftermarket support for the P365 line is strong, so P365X owners can usually find holsters cut for the Romeo-X and spare magazines without trouble. Some buyers feel the factory optic package costs more than buying an iron-sighted P365X and adding a red dot separately.