Find Your SIG® Barrel
| Pistol | Fits | Barrels | Threaded | MSRP |
|---|
| P320 Full Size | SIG® P320 Full Size slides | 5 | Yes | $98–$152.75 |
| P320 Compact | SIG® P320 Compact slides | 4 | Yes | $98–$128 |
| P365 | SIG® P365 slides | 4 | Yes | $96–$124 |
| P365 XL | SIG® P365 XL slides | 3 | Yes | $96–$125 |
Duty Series or Match Series?
| Duty Series | Match Series |
|---|
| Steel | 4150 CMV | 416-R stainless, heat treated for pistol-barrel hardness |
| Rifling | Button rifled 1:10, six grooves, air gauged | Button rifled 1:10, six grooves, air gauged |
| Profile | OEM-style | Flame Fluted®, straight fluted, or spiral fluted |
| Finish | Salt-bath QPQ nitride inside and out | Nitride, or TiN, Chameleon, or Nickel PVD |
| Threaded options | Yes, 1/2x28 | Yes, 1/2x28 |
| MSRP | $96–$99 | $119–$152.75 |
Both lines share the same bore: six-groove, land-and-groove button rifling, not polygonal, so they run jacketed and cast lead bullets. 416-R stainless gets an extra heat-treating step because, as bar stock, it isn’t hard enough for a pistol barrel; 4150 CMV is.
Threaded Barrels, Comps, and Suppressors
Every threaded Faxon SIG® barrel is cut 1/2x28 and ships with a thread protector. Faxon EXOS® compensators are built for each slide: EXOS-515 for P320, EXOS-525 for P365 / P365 XL. Running a suppressor usually calls for suppressor-height sights. Threaded barrels cannot be shipped to California.
How Faxon Pistol Barrels Are Made
- Bar stock gun-drilled and reamed as a long blank
- Button rifled 1:10 with six grooves
- Bore and rifling air gauged
- Stress relieved in-house after rifling, just like Faxon rifle barrels
- Blank cut to length and qualify-turned true to the bore
- Hood, lugs, profile, SAAMI 9mm chamber, and target crown turned and milled; threaded barrels cut 1/2x28
- 416-R Match Series barrels heat treated to pistol-barrel hardness
- Salt-bath QPQ nitride or PVD finish
- Every barrel checked for burrs under 10x magnification and its hood run through a go/thru gauge
- Laser-marked and final inspected
SIG® Barrel FAQs
Which P320 models are not compatible?
Full Size barrels don’t fit M17 or X Series pistols (including the X5 and X5 Legion). Compact barrels don’t fit X-Carry or X-Compact models or slides with a Tactile Loaded Chamber Indicator, including the M18 variant slides.
Are Faxon pistol barrels drop-in?
Yes. They are direct replacements for the factory barrel in factory-spec slides, with no gunsmithing. Some aftermarket slides may need minor fitting; check each product page for compatibility notes.
Can I shoot cast lead?
Yes. Six-groove button rifling is land-and-groove rifling, not polygonal, so Faxon pistol barrels run jacketed and cast lead bullets.
What is the difference between Duty Series and Match Series?
Duty Series barrels are 4150 CMV in an OEM-style profile with salt-bath nitride inside and out. Match Series barrels are 416-R stainless, heat treated for pistol-barrel hardness, and come in fluted profiles with nitride or PVD finishes.
Do threaded barrels include a thread protector?
Yes. Every threaded Faxon pistol barrel is cut 1/2x28 and ships with a thread protector. Threaded barrels cannot be shipped to California.
Do I need an FFL?
No. Pistol barrels ship directly to you.
Where are Faxon pistol barrels made?
In Greater Cincinnati, Ohio.
SIG®, SIG SAUER®, P320®, and P365® are trademarks of SIG SAUER, Inc. Faxon Firearms is not affiliated with or endorsed by them; model names are for compatibility only. Flame Fluted® and EXOS® are trademarks of Faxon Firearms.
