Sig Sauer P365 9mm 3.1″ Optic Ready Black Nitron (2)10rd
Video review
Expert review
About this product
The Sig Sauer P365 9mm 3.1″ Optic Ready Black Nitron is a micro-compact striker-fired pistol that redefined practical concealed carry when it launched by offering 10+1 capacity in a frame comparable to many single-stack subcompacts. It ships with a factory-cut slide ready for direct-fit optics like the SIG ROMEO-X COMPACT, two 10-round magazines, and SIG's proprietary XRAY3 Day/Night sight system right out of the box. This configuration bridges the gap between deep-concealment pocket pistols and service-sized duty weapons, making it one of the most mechanically significant EDC releases in the last decade.
What is the Sig Sauer P365 9mm 3.1″ Optic Ready used for?
This pistol is engineered specifically for everyday concealed carry in a holster, with its design optimizing for a balance of concealability, shootability, and magazine capacity that was previously unattainable. The 3.1-inch carbon steel barrel provides sufficient velocity for modern defensive ammunition, while the compact 5.8-inch overall length and 1.1-inch width allow it to disappear in appendix or strong-side IWB holsters. Unlike a dedicated range gun like the Stevens 334 in .308 Win, the P365's polymer frame and striker-fired system prioritize reliability in close-quarters defensive scenarios over long-range precision.
How does the Sig Sauer P365 compare to the Glock 43?
The P365's definitive advantage over the Glock 43 is its double-stack magazine geometry, which yields 10+1 rounds versus the Glock's 6+1, without a meaningful increase in overall grip width. Mechanically, the SIG achieves this through a unique magazine design with a staggered-column feed lip, whereas the Glock 43 uses a traditional single-stack. For the shooter, this translates to over 60% more on-board capacity in a package that is only 0.04 inches wider—a critical edge for carry where capacity, not caliber, often dictates practical terminal performance in a defense scenario.
What does it weigh and what are the dimensions?
Unloaded weight is 17.8 ounces (504 grams), with dimensions of 5.8 inches in overall length, 4.3 inches in height, and a slide width of 1.0 inches. The grip module width at its widest point is 1.1 inches, which allows for a full three-finger purchase for most hand sizes despite the micro-compact frame. This specific balance of mass and size makes it 2.3 ounces heavier than an alloy-frame revolver like the Smith & Wesson 642, but the added weight improves controllability during rapid strings of fire without crossing the threshold where carry comfort becomes compromised.
Who is this NOT for?
This pistol is not for the shooter seeking a dedicated suppressor host, a competition-focused platform, or a budget-first training gun. The 3.1-inch barrel and non-threaded muzzle limit effective suppressor use compared to a purpose-built pistol like one of our Stevens 555 O/U shotguns with choke tubes, and the micro-compact frame sacrifices some high-volume shooting comfort for pure concealment. If your primary use case involves 200+ round range days or you require a threaded barrel for a Form 4 can, you're better served by a compact or full-size pistol platform from the outset.
What's in the box?
You receive the pistol, two 10-round steel magazines, a hard plastic SIG case, a basic cable lock, and the requisite owner's manual and warranty card. Crucially, the slide comes with the optic cover plate installed over the factory-cut footprint, and the XRAY3 sights are zeroed at the factory for 25 yards with 124-grain FMJ ammunition. Some aftermarket vendors bundle holsters or extra magazines, but SIG's standard packaging is notably sparse compared to some competitors who include a cleaning rod and brush—plan on a separate $25-$40 for a basic field maintenance kit.
Is the Sig Sauer P365 worth it at $523.99?
At this price point, the optic-ready P365 represents strong value for a shooter who intends to mount a micro red dot immediately, as it eliminates the $150-$250 cost and 2-4 week lead time of aftermarket slide machining. Compared to buying the standard P365 and later sending the slide out for milling, this model saves you at least $75 upfront and preserves the factory Nitron finish on the cut surfaces. For the shooter committed to a red-dot-equipped carry gun, this is the most cost-effective entry point into the SIG ecosystem without compromising on factory-quality parts or warranty coverage.
Specs at a glance
Pros & cons
What works
- Factory optic-ready slide eliminates $150+ aftermarket milling cost and 2-4 week lead time
- Delivers 10+1 capacity in a frame only 1.1 inches wide—outpaces the Glock 43 by 4 rounds
- Weighs 17.8 oz unloaded—strikes a balance between shootability and all-day carry comfort
- XRAY3 Day/Night sights provide a crisp, three-dot reference in all lighting conditions
Trade-offs
- Basic grip texture can be insufficient for high-hand purchases; aftermarket stippling or Talon Grips add $20-$50
- Included 10-round magazines have a stiff spring requiring a $25 tool or significant break-in for smooth loading
- No threaded barrel option in this SKU—limits suppressor use versus the P365-Model
Key attributes
| upc | 798681681228 |
| manufacturer | SIG SAUER |
| manufacturer part number | 365-9-BXR3P |
| action | Striker Fired |
| atf type | Pistol |
| barrel finish | Black |
| barrel length | 3.1" |
| caliber/gauge | 9mm |
| capacity | 10 + 1 |
| color | Black |
| length | 10.5 |
| magazine included | 2 x 10-Round |
| model | P365 |
| number of magazines | 2 10 rd. |
| package height | 2.8 |
| package width | 9.6 |
| product type | Semi-Auto Pistol |
| safety | No |
| shipping weight | 2.35 |
| sights | Std. X-RAY 3 Day/Night Sights |
| sights type | Night Sights |
| slide description | Optic Ready/Serrated |
| state restriction (ca) | NO DIRECT SHIP TO CALIFORNIA |
| units per box | 1 |
Frequently asked questions
- Is the slide cut compatible with Holosun optics?
- Yes, the factory optic cut uses the SIG-specific ROMEOZero/Shield RMSc footprint, which directly accepts the Holosun HS407K-X2 and HS507K-X2 micro red dots without an adapter plate. The mounting screws provided with the Holosun will typically fit, but I recommend using the thread locker included and torquing to 15 inch-pounds to prevent zero shift under recoil.
- Does it fit in a Glock 43 holster?
- No, the P365 has a distinctly different slide and trigger guard geometry than the Glock 43, and they are not holster-compatible. You will need a P365-specific holster from brands like Tier 1 Concealed, Vedder, or ANR Design. The firearm's 1.1-inch grip width also means holsters molded for single-stack pistols will be too tight and risk unsafe holstering.
- How long does shipping take to an FFL?
- We process and ship most in-stock firearms like the P365 within 1-2 business days. Transit time via our contracted carriers averages 3-5 business days to your selected FFL dealer. The entire process from order to pickup typically takes 5-8 business days, barring any state-specific waiting periods or background check delays.
- Can I return it if the sights are off?
- We do not accept returns on firearms for sight accuracy issues, as mechanical zero is subject to ammunition type, shooter technique, and distance. The XRAY3 sights are factory-zeroed for 25 yards with 124-grain FMJ. If you suspect a genuine defect in the sight installation, we will facilitate a warranty service request directly with SIG Sauer, which has a 48-hour turnaround for sight-related repairs.
- Does this work with P365XL 12-round magazines?
- Yes, all P365XL 12-round and 15-round magazines are fully compatible with the standard P365 frame. The magazine body will extend approximately 0.8 inches below the grip, providing a full-length purchase. This interchangeability is a key advantage of the SIG modular system over fixed-frame competitors like the Springfield Hellcat.