Silencerco AC861 Threaded Barrel for Glock 17L - 1/2x28 Thread Pitch

The SilencerCo AC861 threaded barrel for Glock 17L is a 6.5-inch 9mm barrel engineered for shooters ready to run a suppressor on their extended-frame duty or competition pistol. Built from 416R stainless steel with a black nitride finish, this barrel delivers the durability and corrosion resistance you need for serious use—whether you're suppressed shooting at the range, training for defensive scenarios, or pushing accuracy limits in IPSC. The 1/2x28 thread pitch is the standard for 9mm suppressor mounts, making it compatible with virtually every modern sound suppressor on the market.

Swapping barrels on a Glock is one of the simplest reliability upgrades available, and a threaded barrel opens the door to quieter, more pleasant shooting without changing your carry or duty gun's ergonomics or reliability. The AC861 maintains Glock's no-fuss design philosophy—drop-in compatibility, no gunsmithing required. Because it's a longer slide than the standard Glock 17, the 17L platform already attracts serious shooters; this barrel lets you match that capability with modern suppressor-ready hardware.

SilencerCo's attention to finish quality means this barrel will handle regular cleaning and extended suppressed use without degrading. The included thread protector keeps your threads safe when you're running unsuppressed, and it's a small detail that speaks to the kind of shooter SilencerCo builds for—one who respects their gear and plans for the long haul.

Key Features

• 416R stainless steel construction with black nitride finish for durability and corrosion resistance
• 6.5-inch length optimized for Glock 17L platform
• 1/2x28 thread pitch—industry-standard 9mm suppressor mount
• Drop-in compatible; no gunsmithing required
• Includes thread protector for safe storage and unsuppressed carry

Specifications

Manufacturer	SilencerCo
Model	AC861
Platform	Glock 17L
Caliber	9mm
Barrel Length	6.5 inches
Thread Pitch	1/2x28
Material	416R Stainless Steel
Finish	Black Nitride
Included Accessories	Thread Protector

Frequently Asked Questions

Will this threaded barrel work with my suppressor?

The AC861 uses the industry-standard 1/2x28 thread pitch for 9mm suppressors. If your suppressor is threaded for 9mm with 1/2x28 (the most common configuration), it will mount directly. Always verify your suppressor's thread pitch and caliber before purchase.

Do I need any special tools or gunsmithing to install this barrel?

No. The AC861 is a drop-in barrel replacement for the Glock 17L—no gunsmithing, special tools, or modifications to your slide are required. Installation takes minutes.

What's included with the barrel?

The AC861 comes with a thread protector to protect the muzzle threads when you're not running a suppressor or between shooting sessions.

Is the AC861 compatible with my Gen 3 or Gen 4 Glock 17L?

Yes, SilencerCo's threaded barrels are compatible with both Gen 3 and Gen 4 Glock models in the 17L platform.