Turn a GLOCK 17 Gen 1-4 into a Suppressor-Ready Host

The SilencerCo AC864 Threaded Barrel is a drop-in-style replacement barrel for compatible GLOCK 17 Gen 1-4 pistols, adding standard 1/2x28 muzzle threads for use with compatible suppressors, compensators and other properly matched muzzle devices.

At 5 inches long, the barrel extends beyond the front of the G17 slide far enough to provide usable muzzle threads while preserving the familiar dimensions and handling characteristics of the full-size 9mm platform.

SilencerCo machines its threaded pistol barrels from 416R stainless steel and finishes this model in black nitride for corrosion and wear resistance. A matching thread protector is included. :contentReference[oaicite:3]{index=3}

AC864 Is for GLOCK 17 Gen 1-4

Generation matters on the GLOCK 17.

This listing is for SilencerCo AC864, the G17 barrel for the original Gen 1-4 locking geometry.

GLOCK 17 Gen 5 pistols use a different barrel locking geometry and require SilencerCo AC5335 instead. SilencerCo currently lists AC864 and AC5335 as separate G17 barrel SKUs specifically for this reason. :contentReference[oaicite:4]{index=4}

Do not purchase AC864 for a Gen 5 G17 simply because both pistols are chambered in 9mm.

Standard 1/2x28 Muzzle Threads

The muzzle is threaded 1/2x28, the most common American thread pitch for 9mm pistol suppressor systems.

This allows the barrel to interface with a wide range of properly matched 9mm suppressor pistons, compensators and other muzzle accessories without requiring an additional barrel-thread adapter.

When a suppressor is used on the G17's recoil-operated tilting-barrel system, the suppressor normally requires an appropriate Nielsen device / booster assembly and 1/2x28 piston. A suppressor piston is not included with the barrel.

Why a Threaded Barrel Is Necessary on a GLOCK

The standard GLOCK 17 barrel terminates essentially flush with the front of the slide. There is not enough exposed barrel beyond the slide to simply add usable suppressor threads to the factory configuration.

A purpose-built threaded barrel solves the problem by extending the muzzle far enough beyond the slide to provide proper thread engagement and clearance for the suppressor piston or other muzzle-mounted accessory.

SilencerCo developed its pistol-barrel line specifically to provide a ready-made suppressor interface rather than requiring the original barrel to be permanently modified. :contentReference[oaicite:5]{index=5}

416R Stainless Steel Construction

SilencerCo specifies 416R stainless steel for its current threaded pistol barrels.

416R is widely used for firearm barrels because it machines consistently and provides a useful balance of strength, dimensional stability and corrosion resistance. The AC864 is further protected by a black nitride finish, giving it a subdued appearance that blends naturally with a factory black GLOCK slide.

Thread Protector Included

SilencerCo includes a thread protector with its threaded barrels.

The protector should be installed whenever no suppressor or muzzle device is attached. It protects the relatively fine 1/2x28 muzzle threads from impact, dirt and other damage during normal use, transport and storage. :contentReference[oaicite:6]{index=6}

Suppressor Use Requires the Correct Piston

The barrel provides the threaded interface on the firearm, but it is only one part of a suppressed pistol system.

For a conventional GLOCK 17 with its tilting barrel, a compatible pistol suppressor generally needs a spring-loaded booster / Nielsen device and a piston matching the AC864's 1/2x28 thread pitch.

SilencerCo specifically notes that a piston is sold separately with its threaded pistol barrels. :contentReference[oaicite:7]{index=7}

5-Inch Overall Barrel Length

SilencerCo currently lists AC864 at an overall barrel length of 5 inches. :contentReference[oaicite:8]{index=8}

The extra length compared with a standard non-threaded G17 barrel is primarily there to place the muzzle threads forward of the slide. It should not be confused with a long-slide G17L or G34 barrel; SilencerCo manufactures separate barrels for those pistols.

A Straightforward Suppressor-Ready G17 Upgrade

For a Gen 1-4 GLOCK 17 owner, AC864 provides one of the simplest ways to add a conventional 1/2x28 suppressor interface without permanently altering the factory barrel.

The original barrel can remain untouched and be reinstalled whenever the shooter wants to return the pistol to its original configuration.

That makes the SilencerCo barrel useful not only for suppressed shooting but also for shooters experimenting with compensators or other properly designed 1/2x28 accessories while retaining the factory barrel as a spare.

Verify Generation Before Ordering

Fitment summary:

• GLOCK 17 Gen 1: Compatible
• GLOCK 17 Gen 2: Compatible
• GLOCK 17 Gen 3: Compatible
• GLOCK 17 Gen 4: Compatible
• GLOCK 17 Gen 5: Not this SKU — use SilencerCo AC5335

Always verify firearm model, generation and barrel fit before live firing.

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GLOCK is a registered trademark of GLOCK, Inc. This product is manufactured by SilencerCo and is not manufactured, authorized, endorsed or warranted by GLOCK.