Glock 39895 45 Acp Fits 21 Gen4 Black Steel

If you run a Glock 21 Gen4 in .45 ACP and want to add a suppressor to your setup, this factory Glock threaded barrel is purpose-built for that job. The Glock 39895 is a genuine OEM replacement barrel that swaps into your Gen4 frame and delivers the same reliability and fit you expect from Glock—nothing exotic, nothing complicated, just the right part to enable suppressor mounting on your .45.

The barrel is chambered in .45 ACP with a 4.49-inch length and uses an M16X1LH thread pattern for suppressor attachment. Glock designed it with a 9.84-inch right-hand twist that works reliably across a wide range of .45 ACP loads, so you're not locked into a narrow ammunition diet. Because it's factory Glock steel, you get the same performance characteristics as the barrel that came in your gun—no surprises, no guesswork.

The barrel ships with a thread protector to keep the muzzle threads safe until you're ready to mount a can. If you're building a suppressed .45 for home defense, precision shooting, or just want to tame the muzzle report, this is a straightforward, reliable upgrade. Drop it in, dial in your preferred suppressor, and get back to shooting.

Key Features

• Factory Glock construction and materials for consistent performance
• M16X1LH threaded muzzle ready for suppressor mounting
• Compatible with Glock 21 Gen4 frames
• 9.84-inch right-hand twist rate for broad ammunition compatibility
• Includes thread protector
• .45 ACP chambering

Specifications

Frequently Asked Questions

What Glock models does this threaded barrel fit?

This barrel is designed for the Glock 21 Gen4, which is chambered in .45 ACP. Do not attempt to install it in other Glock models or generations without verifying compatibility.

Will this barrel work with a suppressor?

Yes. The M16X1LH thread pattern is standard for .45 ACP suppressors. A thread protector is included to protect the muzzle threads when a suppressor is not attached.

What ammunition does this barrel shoot reliably?

The 9.84-inch right-hand twist rate is designed to stabilize a wide range of .45 ACP ammunition, so you're not restricted to a narrow selection of loads.

Is this a genuine Glock part?

Yes, this is an OEM Glock barrel made to the same specifications and materials as factory Glock barrels, ensuring the same performance and reliability.