FAXON DUTY SERIES THREADED BARREL FOR G19 / G45 / G19X Gen 2–6 9MM

Pistol Barrels › For Glock® › For G19  |  Works with: EXOS-513 for Gen 3 • EXOS-543 for Gen 4 • EXOS-553 for Gen 5

Fit and Compatibility

This barrel is a direct replacement for the factory barrel in Glock® 19 Gen 2–6, Glock® 45, and Glock® 19X slides. It is machined to tight tolerances for consistent lockup, and it drops into factory-spec slides with no gunsmithing. On some aftermarket slides, minor fitting may be needed.

Gen 6 compatibility: As of Job #16477 (engraved on the non-ejection side of the barrel hood), this barrel includes the Gen 6 relief cut and is compatible with the Glock® 19 Gen 2–6, the Glock® 45 (G45), and the Glock® 19X (G19X). Units made before Job #16477 are Gen 6 compatible, though increased wear in the area of the relief cut is possible.

The Glock® 45 and Glock® 19X are 9mm pistols with a G19-length slide and barrel on a G17-length frame, so they take a Glock® 19 barrel, not a .45 ACP barrel.

Aftermarket slides: there is a known compatibility issue with some Zaffiri Precision slides (ZPS.3v2 and ZPS.6 patterns) because of top-window size and placement.

Shipping: threaded barrels cannot be shipped to California.

How It’s Made

Every Faxon pistol barrel starts as a long 4150 CMV barrel blank that Faxon rifles in-house before it is ever cut into pistol barrels. That way the whole blank gets the same rifling, inspection, and stress relief, and every barrel cut from it starts from a qualified bore.

1. Drill and ream: 4150 CMV bar gun-drilled and reamed as a long blank
2. Button rifle: Button rifled 1:10, six grooves
3. Air gauge: Bore and rifling air gauged
4. Stress relieve: Stress relieved in-house after rifling, just like Faxon rifle barrels
5. Cut and qualify: Blank cut to length and qualify-turned true to the bore
6. Turn and mill: Hood, lugs, and profile turned and milled; 9mm SAAMI chamber and target crown cut; muzzle threaded 1/2x28
7. Finish: Salt-bath QPQ nitrided inside and out
8. Mark and inspect: Laser-marked and final inspected

Six-groove button rifling is land-and-groove rifling, not polygonal, so it runs jacketed and cast lead bullets. Salt-bath QPQ nitride is a diffusion treatment, not a plating: it hardens the bore and exterior and adds corrosion resistance and lubricity while adding virtually nothing to the dimensions.

How We Inspect It

Faxon pistol barrels are built to a written control plan, and each run is logged on inspection sheets. Here is what this barrel goes through before it ships.

What’s in the Box

What Owners Say

Average rating: 5.0 out of 5 stars from 18 reviews on FaxonFirearms.com.

Every Faxon Barrel for the G19 / G45 / G19X

Add a compensator: Faxon EXOS-513 for Gen 3 • Faxon EXOS-543 for Gen 4 • Faxon EXOS-553 for Gen 5. Faxon EXOS® comps thread onto the 1/2x28 muzzle; use the included thread locker on the barrel threads only, not on the set screws.

Duty Series G19 / G45 / G19X Barrel FAQs

Is this barrel drop-in?

Yes. It is a direct replacement for the factory barrel in Glock® 19 Gen 2–6, Glock® 45, and Glock® 19X slides with no gunsmithing on factory-spec slides. Some aftermarket slides may need minor fitting.

How is it rifled?

Button rifled, 1:10 twist, with six grooves. Faxon rifles a long blank in-house, air gauges the bore and rifling, and stress relieves it before cutting it into pistol barrels.

Can I shoot cast lead bullets?

Yes. Six-groove button rifling is land-and-groove rifling, not polygonal, so it runs both jacketed and cast lead bullets.

What is the difference between Duty Series and Match Series pistol barrels?

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 and PVD color options.

What finish is it?

Salt-bath QPQ nitride, inside and out.

Can I run a suppressor or compensator?

Yes. The muzzle is threaded 1/2x28, the common 9mm thread, and a thread protector is included. You will likely need suppressor-height sights to see over a suppressor.

Can it ship to California?

No. Threaded barrels cannot be shipped to California.

Will it fit a Ruger® RXM?

Faxon did not test its G19 barrels with the Ruger® RXM during development. Some customers report running them, but manufacturing tolerances vary, so fit is not guaranteed.

Where is it made?

In Greater Cincinnati, Ohio. Pistol barrels ship without an FFL.

GLOCK® is a federally registered trademark of GLOCK, Inc. and GLOCK Ges.m.b.H. 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. Know and follow all federal, state, and local laws.