SIG Sauer P365XL 9mm, 3.7 in Barrel, Nitron Slide, XSeries Grip, ROMEOZero Red Dot, 12+1, Two 12-Round Mags
This SIG Sauer P365XL pairs the XL-length 3.7 inch barrel and XSeries ergonomics with a SIG Sauer ROMEOZero red dot installed after purchase. The stainless slide wears a Nitron finish with front and rear serrations and an RMSc-footprint optics cut. It includes two 12-round factory magazines, a single-slot accessory rail, and the flat-faced XSeries trigger with no external manual safety.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: Light, superficial handling marks are present on exterior surfaces.
What’s Included
- SIG Sauer ROMEOZero micro reflex red dot sight (installed after purchase)
- Rear backup notch integrated into ROMEOZero housing
- Two 12-round factory steel magazines (marked "Made in USA")
- SIG Sauer P365 series owner's manual
- SIG Sauer OEM hard case (gray)
The P365XL configuration delivers the longer 3.7 inch barrel and extra sight radius in the compact P365 platform. The XSeries grip module adds an extended beavertail and a flat-faced trigger for a consistent, straight-back press. This example is chambered in 9mm Luger with a 12+1 capacity using the included factory 12-round magazines.
The slide is stainless steel with a Nitron finish and features both front and rear serrations. It is cut for RMSc-footprint optics and currently has a SIG Sauer ROMEOZero micro red dot installed after purchase. A backup rear notch is integrated into the optic housing, paired with a front blade featuring a green dot for an immediate secondary sighting option.
The polymer XSeries grip module offers a secure hold with the extended beavertail, and the frame includes a single-slot accessory rail for compatible lights or accessories. This model is striker-fired and configured with no external manual safety.
Made in the USA, this P365XL carries SIG's mfg part number L365XL-9-BXR3. It ships with the original SIG Sauer hard case and P365 series owner's manual. The serial number on the frame matches the case label.



