Faxon Duty Series 4150 CMV Black Nitride Threaded 9mm Conversion Barrel for Glock 22 Gen 2–4

The Faxon Duty Series threaded 9mm conversion barrel lets Glock 22 Gen 2 through Gen 4 owners run affordable 9mm through their 40 S and W pistol with a simple barrel swap. One pistol, two calibers, no gunsmith and no fitting. It is one of the most cost effective things you can do for a duty sized Glock you already own.

The math is brutally simple. Nine millimeter costs less than 40 caliber at the register, and a barrel that lets you train more is a barrel that makes you better.

How the Faxon Duty Series Conversion Barrel Works

A Glock 22 and a Glock 17 share the same frame and slide dimensions, which is why a caliber conversion barrel works at all. Drop this barrel into your G22 slide, feed it from 9mm magazines, and the pistol runs 9mm with the same grip, the same trigger, and the same holster. Your muscle memory carries over completely because nothing else about the gun changes.

This is for the high volume trainer, the shooter who inherited a 40 caliber pistol and wants cheaper practice, and the suppressor owner who would rather host a can on 9mm than on 40. Keep the factory barrel in the range bag and the pistol switches back to its original chambering in under a minute.

Key Features

• Faxon Duty Series build quality in a barrel that converts a Glock 22 Gen 2 through Gen 4 to 9mm
• Machined from stress relieved 4150 CMV steel for duty grade strength and consistency
• Salt bath nitride finish for hardness, corrosion resistance, and easy cleanup
• Conventional rifling that supports a wide range of ammunition including cast lead bullets
• 1:10 twist rate that properly stabilizes most 9mm projectiles
• Threaded muzzle ready for a suppressor, compensator, or thread protector

The Specifications in Detail

Faxon Duty Series barrels are machined from stress relieved 4150 CMV steel and finished in salt bath nitride, a duty grade combination built for shooters who prioritize performance, longevity, and versatility. Stress relieving matters because a barrel that shifts as it heats is a barrel that walks its groups, and nitride treatment puts a hard, corrosion resistant skin on every surface.

The conventional rifling profile is a genuine functional advantage. It supports a wide range of ammunition, including the cast lead bullets that are often avoided in factory polygonal barrels, which opens the door to inexpensive reloads and cast bullet practice. For anyone loading their own, that alone justifies the barrel.

The 1:10 twist rate properly stabilizes most 9mm projectiles for consistent performance whether you are training at the range or carrying for personal defense. The threaded muzzle stands ready for your suppressor or compensator, and a thread protector keeps the threads clean when nothing is mounted.

Installation, Magazines, and Care

Installation is a standard field strip. Lock the slide, drop the takedown, remove the slide, swap the barrel, and reassemble. No fitting, no filing, and no gunsmith invoice, which is exactly what a drop in barrel should mean.

You will need 9mm magazines, since 40 caliber magazines will not feed 9mm reliably. Glock 17 magazines are the usual answer and they seat correctly in the larger frame. Function test with a full magazine of the ammunition you plan to shoot before trusting the setup, and re zero your sights because the new barrel will likely shift point of impact.

Cleaning is conventional and easier than a polygonal barrel when you shoot lead. Brush the bore, wipe the exterior, and keep the threads clean and lightly oiled under the protector. Find cases, mats, and cleaning supplies in our Apparel and Gear collection to keep the setup organized.

With 9mm typically costing well under 40 caliber at the register, this barrel can pay for itself in ammunition savings within a few range sessions, all while giving one pistol two genuinely useful personalities. Faxon built it to duty standards, so the savings never come at the cost of reliability. Ships direct to your door, no FFL required.