SIG Sauer P365
- Category
- Pistol
- Barrel
- 79 mm
- Weight, empty
- 505 g
- Introduced
- 2018
About
What it is, and why it matters
The SIG Sauer P365 is a revolutionary micro-compact striker-fired semi-automatic pistol introduced in 2018 that redefined the concealed carry market. Chambered in 9x19mm Parabellum, the P365 features an innovative modified double-stack magazine design that achieves unprecedented capacity in an ultra-compact package, offering 10+1 rounds in a flush-fit magazine with options for 12, 15, 17, and even 21-round extended magazines. The pistol features a 3.1-inch barrel, 5.8-inch overall length, and weighs just 17.8 ounces unloaded, making it one of the most concealable full-capacity pistols available. Built with a stainless steel slide featuring a corrosion-resistant Nitron finish, stainless steel frame components, polymer grip module, and carbon steel barrel, the P365 is rated for +P ammunition. Standard features include XRAY3 day/night sights with a 4.9-inch sight radius, striker safety, disconnect safety, reversible magazine release, and front and rear slide serrations. The P365 quickly became the best-selling concealed carry pistol in the United States and has been widely adopted by law enforcement agencies including the Michigan State Police, Indiana State Police, and Chicago Police Department. Its success spawned an entire family of variants including the extended P365XL, optics-ready P365X, snag-free P365 SAS, and high-capacity P365 XMACRO.
The P365 revolutionized the concealed carry market by cramming 10+1 rounds of 9mm into a package previously only capable of holding 6-7. It won the 2019 NSSF Handgun of the Year award and forced every major manufacturer to redesign their micro-compact offerings to compete with its capacity-to-size ratio.
The P365 introduced SIG Sauer's patented modified double-stack magazine technology, which allows for significantly higher capacity than traditional single-stack micro-compacts while maintaining similar dimensions. The pistol was awarded the 2019 Handgun of the Year by the National Shooting Sports Foundation (NSSF). Early production models experienced some teething issues including striker drag and spring breakage, which were resolved in later production runs. The P365 platform is modular, with the serialized fire control unit removable and compatible across different grip modules and caliber configurations. Optional features include manual thumb safety variants. The P365's commercial success prompted competitors to develop similar high-capacity micro-compact designs, fundamentally changing the concealed carry market segment.
Specification
Everything measured
IdentityWhat it is, who built it and when.
- Manufacturer
- SIG Sauer
- Category
- Pistol
- Country
- United States
- Status
- In production
- Produced
- 2018
DimensionsAs issued, without a magazine or an optic.
- Barrel
- 79 mm
- Overall length
- 147 mm
- Height
- 109 mm
- Width
- 27 mm
- Sight radius
- 124 mm
- Weight, empty
- 505 g
ActionHow it cycles, what trips it, and what feeds it.
- Action
- Short recoil
- Firing mechanism
- Striker fired
- Trigger
- Single action
- Trigger pull
- 27.0 N
- Capacity
- 10
- Magazine
- Detachable box
MaterialsEach swatch is the material itself, not a colour chosen to stand for it.
- Frame
- Polymer
- Slide
- Stainless steel
- Barrel
- Carbon steel
- Finish
- Nitron
BallisticsFrom the service cartridge, not a handload.
- Muzzle velocity
- 360 m/s
- Muzzle energy
- 481 J
- Effective range
- 25 m
- Maximum range
- 1800 m
Trajectory
What the round does downrange
Solved from the muzzle figures and the bullet. The dashed rule is the effective range on the record, and the crosses are the steps the solver returned.
Features
What it has
What the record lists as fitted, drawn from the catalogue.
Micro compact design
Xray3 day night sights
Reversible mag release
Extended magazine compatibility
Plus p rated
Modular grip system
Front rear slide serrations
Standing
How it compares
Each figure against the firearms of the same type and cartridge that record it, or of the same type where that cartridge has too few. Positions are read to the nearest tenth.
| Measurement | This firearm | Median | Position |
|---|---|---|---|
| Empty weightAmong 560 9x19mm Parabellum pistols | 505 g | 765 g | Lighter than about 90% |
| Overall lengthAmong 559 9x19mm Parabellum pistols | 147 mm | 191 mm | Shorter than about 90% |
| Barrel lengthAmong 569 9x19mm Parabellum pistols | 79 mm | 105 mm | Shorter than about 90% |
| Magazine capacityAmong 571 9x19mm Parabellum pistols | 10 | 15 | Holds fewer rounds than about 80% |
Its place in the rankings
Answers
Questions about the SIG Sauer P365
How much does the SIG Sauer P365 weigh?
The SIG Sauer P365 weighs 505 g (1.11 lb) empty.
What caliber is the SIG Sauer P365?
The SIG Sauer P365 is chambered in 9x19mm Parabellum.
How many rounds does the SIG Sauer P365 hold?
The SIG Sauer P365 holds 10 rounds, fed from a detachable box magazine.
How long is the SIG Sauer P365?
The SIG Sauer P365 is 147 mm (5.79 in) long overall, with a 79 mm (3.11 in) barrel.
Who makes the SIG Sauer P365?
The SIG Sauer P365 is made by SIG Sauer (Germany).
When was the SIG Sauer P365 introduced?
The SIG Sauer P365 was introduced in 2018.
How does the SIG Sauer P365 operate?
The SIG Sauer P365 uses a short recoil action, and its firing mechanism is striker fired.
Compatibility
Which parts fit this firearm
Studio
Every part that mounts on this, resolved
Not a list the maker typed out: the answer comes from the mounts this firearm exposes and the interface each part needs, so it stays right when either one changes.
- Every part that mounts on any firearm in the catalogue
- Interface standards, platforms and fit overrides
- The same answers through the API and the MCP server
Requires a signed-in GunSpec account on the Studio plan. The answer is computed per part, so it is not part of the public record.
Provenance
What the record holds
Every figure above was taken from one of these pages. The confidence reflects how much of the record came from a page a claim can be checked against.
In service
- Michigan State Police
- 2024
- Indiana State Police
- 2019
- Chicago Police Department
- United States
- Miami Beach Police
- United States
Provenance
Confidence in this record
88%
Stockists
Where to buy
Offers link straight to the shop. GunSpec never takes the order.
No shop has listed this firearm yet
Stock and prices come from the shops themselves. If you sell this firearm, you can list it and it appears here.
List a firearmMCP
Ask an assistant about it
The same record, reached the way a person asks for it rather than the way a program does.
Ask GunSpec
Works with
Point an MCP client at GunSpec and it answers from the catalogue rather than from memory. A free key covers the read tools.
API
The call that returns this record
The same fields, in the same units, from the same endpoint the page reads.
curl --request GET \ --url 'https://api.gunspec.io/v1/firearms/sig-sauer-p365' \ --header 'X-API-Key: your_key'{ "id": "sig-sauer-p365", "name": "SIG Sauer P365", "manufacturer": { "id": "sig-sauer", "name": "SIG Sauer", "countryCode": "DE", "foundedYear": 1985, "website": "https://www.sigsauer.com", "logoUrl": null, "description": null, "status": null, "defunctYear": null, "stateOwned": null, "makesFirearms": null, "parentId": null, "predecessorId": null, "createdAt": "2026-02-11 23:44:40", "updatedAt": "2026-02-18 03:40:48", "version": "944f4088befdcee3b0aa7caf122998351ef3d78abc525a2bdec9df81e65a6b30" }, "category": { "id": "pistol", "name": "Pistol", "description": "Handguns designed to be fired with one or two hands" }, "country_of_origin": "US", "year_introduced": 2018, "barrel_length_mm": 79, "weight_empty_g": 505, "action_type": "short_recoil"}