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The P365X was built around a specific idea: keep the original P365's slim, concealable profile, but give the shooter a full-length grip, a flat-faced trigger, and a slide that's ready for an optic right out of the box. This configuration goes a step further by shipping with the ROMEO-RS Compact already mounted and factory-zeroed, so there's no waiting on an optic purchase or a slide milling appointment. You open the box and the gun is ready to train with and carry.
The XSeries grip module is what separates the P365X from the standard P365. It features a taller grip with an integrated mag funnel and extended beavertail, which gives you a higher, more consistent hand position and helps manage recoil during follow-up shots. The X flat trigger breaks at 90 degrees and provides a consistent, repeatable pull that's well-suited to a carry gun. The stainless steel slide wears a Nitron finish for corrosion resistance, and the overall width stays at just 1.1 inches, keeping it narrow enough to disappear under a t-shirt or tucked dress shirt.
The ROMEO-RS Compact uses a 32 MOA circle combined with a 2 MOA center dot, which is a genuinely practical reticle for a carry pistol. The outer ring is fast to find on the draw, while the 2 MOA dot lets you be precise when the shot demands it. The optic uses a hybrid skeletonized steel chassis inside a high-strength polymer housing, with a premium aspherical glass lens that keeps the sight picture clear and distortion-free. MOTAC motion activation wakes the optic when you pick up the gun, and the side-loading CR1632 battery tray lets you swap batteries without pulling the optic off the slide, which means your zero stays put. SIG rates the runtime at 20,000 hours at medium brightness.
The XRAY3 Day/Night sights that come standard on the P365X are not an afterthought. They use tritium inserts for low-light visibility and a high-contrast front sight that's easy to pick up in full daylight, giving you a reliable backup option if the optic ever needs a battery or takes damage. The slide is also cut to the Shield RMSc footprint, so if you ever want to swap to a different compatible optic down the road, the options are wide open.
At 17.8 oz loaded with one magazine and measuring 6 inches in overall length, the P365X fits comfortably in both IWB and appendix holsters without printing or shifting throughout the day. The two included 12-round steel magazines sit flush with the grip when fully inserted, keeping the whole package clean and carry-ready.
SIG SAUER ships the P365X with the ROMEO-RS Compact installed on the slide. Like any pistol optic, it is a good idea to confirm and refine the zero to your specific hold and preferred distance when you first get to the range. SIG recommends starting the sight-in process at 5 to 7 yards on paper before moving the target out.
Yes. The P365X slide is cut to the Shield RMSc footprint, which is one of the most common standards in the compact pistol optic market. This means there is a wide selection of compatible third-party optics available if you ever decide to change things up. SIG also uses steel recoil pins in the footprint design to help prevent lateral optic shift under recoil.
The P365X uses the XSeries grip module, which is taller than the standard P365 grip and includes an integrated mag funnel and extended beavertail. This gives you a fuller, more secure grip and better recoil control, while the barrel and slide length remain the same as the standard P365 at 3.1 inches. The 12-round flush-fit magazine is also standard with the X grip module, compared to the 10-round magazine that ships with the base P365.
The ROMEO-RS uses a 32 MOA outer circle paired with a 2 MOA center dot. The large ring helps you find the reticle quickly on a fast draw, which is important in a defensive situation where your presentation might not be perfect. The 2 MOA dot lets you slow down and be more precise when distance or target size requires it. MOTAC motion activation means the optic powers on automatically when the gun is picked up, so there is no switch to remember.
You will need a holster specifically designed to accommodate the Shield RMSc optic footprint. Most quality Kydex IWB and OWB holster makers now offer P365X-specific options with optic cutouts sized for compact red dots in this footprint. It is worth confirming optic compatibility with your holster maker before ordering, especially for appendix carry rigs where fitment tolerances are tighter.
The 3.1-inch barrel and 6-inch overall length make the P365X one of the better-suited carry pistols for appendix or IWB carry, since a shorter barrel reduces discomfort when seated or bending. The overall width of 1.1 inches keeps it slim against the body, and the 17.8-ounce weight is light enough to go unnoticed throughout the day with a quality belt and holster setup.
| UPC | 798681719976 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 365X-9-BXR3P-RS |
| Action | |
| ATF Type | Pistol |
| Barrel Finish | Black |
| Barrel Length | 3.1" |
| Caliber/Gauge | 9mm |
| Capacity | 12 + 1 |
| Color | Black |
| Length | 10.2500 |
| Magazine Included | 2 x 12-Round |
| Model | |
| Mount Type | Shield RMSc Footprint |
| Number of Magazines | 2 12 rd. Steel Magazines |
| Package Height | 2.7 |
| Package Width | 7.4 |
| Product Type | Semi-Auto Pistol |
| Shipping Weight | 2.5 |
| Sights | X-Ray 3 Day/Night Sights |
| Sights Type | Night Sights |
| Slide Description | Optic Ready/Serrated |
| State Restriction (CA) | NO DIRECT SHIP TO CALIFORNIA |
| State Restriction (RI) | NO DIRECT SHIP TO RHODE ISLAND |
| State Restriction (WA) | NO DIRECT SHIP TO WASHINGTON |
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