Sig marketing doesn't seem to have any problem changing/adding designations when releasing new models which makes tracking what is what complicated.

Currently... there are 4 grips:

• standard - proprietary rail, 10 rd flush mags
• X - proprietary rail, 12 rd flush mags
• Macro - 1913 rail, 17rd flush-ish mags
• AXG Legion - aluminum, g10 scales, 1913 rail, 17rd mags
  • slight difference in 1913 rail affects XMacro holster compatibility

and 3 barrel lengths:

• 3.1"
• 3.7"
• 4.3"

and 5 slides (more if you count the optic plate variations):

• original ('short'): takes 3.1" barrel and uses a double spring RSA
  • revised for the 365X to include an optic plate
  • SAS slide is ported and has different slide release and sights
• L ('long'): takes 3.7" barrel and uses a single spring RSA
  • original L slide has the rear sight included in the optic plate
    • usually these are marked 'XL'
  • revised L slide has the rear sight separate from the optic plate
• Spectre/Macro Comp: 3.1" barrel in 3.7" slide with integral comp using the single spring RSA, optic ready
  • 'comp' slides have suppressor height sights (usually)
  • 'comp' slides are dimensionally identical to the L slide and fit the same holsters
• 380: lightened 3.1" slide using a 380-specific barrel and double spring RSA, optic ready
• FUSE: long slide using the 4.3" barrel and longer, single-spring RSA, optic ready.

The various released models mix and match the slides and grips:

• 365: standard grip and 3.1" slide/barrel
• 365 SAS: standard grip and 3.1" slide/barrel (with special porting, controls and sights)
• 365 XL: X grip and 3.7" barrel and one of the 3.7" optic-ready L slides
• 365 X: X grip and 3.1" barrel and the 3.1" optic-ready slide
• 365 XL Spectre: X grip and 3.7" L slide
  • slide has cosmetic differences: serrations, cut outs, distressed finish
• 365 XL SpectreComp: X grip and 3.7" comp'ed slide
  • cosmetics: gold TiN controls, 'Sig Custom Works' engraved slide
  • laser stippled grip
• 365-380: standard grip with 380 barrel and slide
• 365 XMacro(Comp): macro grip and 3.7" comp'ed slide
  • released as the XMacro but called XMacroComp after the TacOps was released
• 365 XMacro TacOps: macro grip and 3.7" non-comp L slide
• 365 AXG Legion: AXG grip and 3.7" comp slide
• 365 FUSE: XMacro grip and 4.3" slide/barrel/RSA
  • one 17rd and two 21rd mags

So, the model decoder (up to this point) is:

• 'X' designates 12rd grip, flat trigger and optic ready slide
• 'L' designates the 3.7" barrel and slide
• 'Macro' designates the 17rd grip module
• 'Comp' designates the 3.1" barrel and optic ready integral comp slide
• 'MS' in the SKU indicates a factory installed manual safety
• 'SAS' (Sig Anti Snag) has a unique fibre optic sight, minimized controls and a ported barrel/slide
  • the ported barrel was phased out relatively quickly
• 'Rose' designates rose-colored TiN controls and packaging applied to regular models
• 'TacOps' package includes extra mags (more than the standard 2)
• 'TacPac' includes extra mags and a holster
• 'AXG Legion' uses an aluminum grip module with Legion graphics, challenge coin
• 'FUSE' currently indicates the long 4.3" barrel/slide on the XMacro grip

Magazines

• capacities
  • 10 rd (9mm or .380)
  • 12 rd (9mm or .380)
  • 15 rd - discontinued after 17rd mag was released
  • 17 rd
  • 21 rd - extra capacityfrom a longer magazine body not an extended base plate
• 365-380 mag differences
  • marked with '.380' instead of '9mm'
  • have a plastic spacer inside the spring coils
  • have slightly different feed lips
  • 9mm mags can be used with 365-380s
    • not supported by Sig but those who have tried reported success
  • .380 mags can be used for 9mm if the plastic spacer in the spring coil is removed
    • again, not supported but works

+2 kits (flat spring + baseplate) are available for the 10, 12 and 15 rd mag bodies:​

MagGuts +2 kits (works with 9mm and .380 mag bodies)​

​

+2/+3 kits are available for the 17 rd body​

Taran Tactical +3 kit​

Generally speaking

• 365 FCUs may be fitted with the optional manual safety
  • the FCU requires a grip module with safety cutouts if the safety is installed
  • the required safety cutouts are marked on Sig grip modules
    • jigs are also available
  • XMacro grips, being slightly wider, may need additional relief for the safety levers
• 365 FCUs fit any grip module
  • the FCU is available separately, as a standalone component, in gold TiN or plain black (nitride, not TiN)
• 365 slides are interchangeable
  • meaning a complete slide assembly will work on any FCU/grip
    • for example taking the 365X slide and using it on a XMacro grip+FCU
  • not all barrels are compatible with all slides
    • 365-380 3.1" barrel only works in the 365-380 slide
    • 3.7" barrel works in the 3.7" non-comp 'L' slide
      • also works in the short slide - like a threaded barrel with no threads
    • 3.1" barrel does not work in the 3.7" non-comp 'L' slide
• longer mags work in shorter grips
  • spacers are available to fill the gap between base plate and pistol grip
    • short grip
    • X/XL grip
  • base plates are available for shorter mags so they work in longer grips
    • X/XL grip (10rd)
    • XMacro grip (10rd, 12rd, 15rd)
• holster compatibility is determined by overall slide length and type of rail

 

So, the model decoder (up to this point) is:

• "X" designates a flat trigger and optic ready slide
• "L" designates the 12rd grip module
• "Macro" designates the 17rd grip module
• "MS" in the SKU indicates a factory manual safety
• "SAS" (Sig Anti Snag) has a unique fibre optic sight, minimized controls and a ported barrel/slide
• "Rose" designates rose-colored TiN controls and packaging applied to regular models

While I like your list, it doesn't jive with the P365X which has what you call the "L" frame but is marked X, not L. It seems "X" refers to the longer frame while "L" refers to the longer 3.7" barrel.

Also don't forget the P365-380, which as of this writing is only available in the standard format with a 3.1" barrel and 10rd grip frame. While the upper assembly is different, the entire lower including FCU is the same as a standard P365 so you can mix n' match lowers.

 

I like this article from Pew Pew Tactical that breaks it down:
Sig Sauer P365 Models: History, Evolution, & Why They’ve Remained #1

They got one for the 320 too.

 

Didn't we just have a discussion on this?
And 9mmbhp's chart should be stickied somewhere for those scratching their heads about what's what.

 

I found this on Wiki, it may be helpful:

Update from
April 2025

 

I found this on Wiki, it may be helpful:

View attachment 553313

What doesn't look right is the XMACRO has a 3.1" barrel and an OL of 6.6" ?

 

(ETA: somebody posted something similar to what is below recently but I couldn't find it... maybe we should combine and create a sticky?)

Sig marketing doesn't seem to have any problem changing/adding designations when releasing new models which makes tracking what is what complicated.

Currently...

Great info.

 

This thread has some useful/helpful information and links. One of our staff, Nick, recommended it for a sticky. I concur and it is now a sticky

 

This thread really lays it all out there in a way that makes it easy to understand the differences between the various models.
Thanks for the information.

 

Yup. Appreciate it.

 

FYI, You can/could get a P365 (not X) w/an optics ready slide. I've got one. Same curved trigger and 10+1 capacity as any other P365.

 

I followed this thread long before it became a “sticky “. Great questions. Great answers. Sig just (apparently) keeps everyone on their toes trying to follow the continuing iterations.

 

I will say that I had a 365 and sold it and bought a 365X. I like the extra height for my hand and I love the flat trigger. If I had a 365, the flat trigger would be the first thing I'd replace

 

I know everyone will call out, "TROLL" since I have a low post count. Well then, EVERYONE has been a TROLL. But, please, feel free to ignore or block me.

Anyway, to compare differences, I use the tool(s) at Visually Compare Pistol And Revolver Dimensions, Weight, Capacity, And More | Handgun Hero

Actually Handgun Hero is WRONG! The Macro has a 3.7" barrel, not a 3.1" The 365 XL has a 3.7" barrel and the two slides are the same. You can't put a 3.1" barrel in those slides.

 

P365-XMACRO

MACRO means MORE. NO RECEIPTS NO WARRANTY CARDS FULLY-TRANSFERABLE FOREVER SIG SAUER® Infinite Guarantee™

www.sigsauer.com

 

XMacro Comp has 3.1. Standard XMacro has 3.7.

 

These numbers are also applicable to the spectre comp and standard XL (3.1” barrel and 3.7” barrel, respectively)

 

If I may add one more point of clarification to this already excellent thread, while the slides are interchangeable between the 9 mm and the 380 versions, it definitely must be done as an assembly, since the barrels are completely different. The 380 barrel is almost paper thin as compared to the 9 mm barrel, so while the ID may be roughly the same, the OD is completely different. The recoil rod/ spring assembly is also completely different between the two.

 

Great info! Thanks to all that have shared.

 

I am about to venture into the modification world for my 365. I am very happy to have found this thread. GREAT info.

 

Same here... keep us posted as I am in learning/sponge mode. Bought the wife the 380 Rose and myself the Macro comp and the Spectre Comp. I have one DPM recoil kit and one True Precision barrel arriving tomorrow. Thinking of upgrading one of the guns so I can notice the changes and then decide if if there is a better route for the 2nd build. Do you have any plans already in play?

 

Yes helped me for sure!! thanks all for contributing!

 

Will 17 round macro mag fit the X?

 

Yes, longer mags fit in the shorter grips. Most if bought as stand alone will have the plastic spacers.

On another note I had someone tell me the fcu in the legions only fits the legion frame. Lots of mis information out there.

 

Followed for knowledge and insight on the multitude of P365 models. Still waiting on an even "thinner" single-stack version...

 

Thanks!!! This has been a REAL assist.
Question: adding optical sights: What's available? My wife and I both EDC with a "standard" P-365 and she may want a red dot.

 

Question: adding optical sights: What's available? My wife and I both EDC with a "standard" P-365 and she may want a red dot.

Below is a list of optical sights to the Shield Reflex Mini Sight/Compact (RMSc) footprint/mounting standard that will fit directly to any P365 optic ready slide.

This list isn't exhaustive; if you are shopping for a sight, check if it mentions "RMSc" footprint, and you should be good to go.

Sig Romeo Zero
Sig Romeo Zero Elite
Sig Romeo X Compact
Holosun 407k/507k
Holosun EPS Carry*
Jpoint
Shield RMSc
Swampfox Sentinel
Springfield Armory Hex Wasp
Vortex Defender CCW
Vector Optics Frenzy

*The Holosun EPS will fit also, but it's more of a double stack optic width, and will overhang a bit on a P365 slide.

 

I wish I would’ve found this detailed description before I purchased my standard P365! I wanted something smaller than my Canik TP9 SC elite to EDC. Didn’t realize I could’ve purchased the X or the XL and gotten increased mag capacity right out the box. I ended up buying the 12 round mags plus the X frame from Sig also.

 

Not an option for some of us in 10 capacity mag states.

 

The Sig options can be overwhelming so pre-purchase independent research or a truly customer focused salesperson is essential. The good news, and it sounds that you have already discovered it, is that whatever you bought can generally be reconfigured - at a price of course.

 

Once I totaled up what I spent, that’s when I realized I could’ve gotten the X and just purchased a smaller grip frame 😂

Also due to me browsing the Sig website in the middle of the night, I purchased an XMacro frame thinking I was getting the X/XL frame smh. Eventually I will purchase a longer slide for the extra frame.

 

P365*: The standard P365 is a compact, subcompact pistol designed for concealed carry. It typically has a flush-fit magazine with a capacity of 10 rounds. The P365 is known for its small size, making it easy to conceal while still offering a decent capacity for its size.

P365X*: The P365X is an upgraded version of the P365, offering additional features and enhancements. It usually comes with a longer slide and barrel, providing better accuracy and sight radius. The P365X often includes features like an optics-ready slide, a flat trigger, and improved ergonomics compared to the standard P365.

P365XL*: The P365XL is a larger variant of the P365 series, designed for those who prefer a slightly bigger pistol with a longer grip and increased magazine capacity. The P365XL typically comes with a 12-round magazine and offers a longer slide and barrel than the standard P365, providing improved accuracy and control.

In summary, the standard P365 is compact and ideal for concealed carry, the P365X offers enhancements like an optics-ready slide and improved ergonomics, while the P365XL is larger with increased capacity and a longer grip.

 

P365*: The standard P365 is a compact, subcompact pistol designed for concealed carry. It typically has a flush-fit magazine with a capacity of 10 rounds. The P365 is known for its small size, making it easy to conceal while still offering a decent capacity for its size.

P365X*: The P365X is an upgraded version of the P365, offering additional features and enhancements. It usually comes with a longer slide and barrel, providing better accuracy and sight radius. The P365X often includes features like an optics-ready slide, a flat trigger, and improved ergonomics compared to the standard P365.

"wxl, 365X is same length bbl as 365"