.45 SilencerCo Threaded Barrel for Glock 21

Outfit your Glock 21 for suppressor use without compromising reliability. This SilencerCo .45 ACP threaded barrel is machined from 416R stainless steel, offering consistent accuracy and long-term resistance to wear.

The .578-28 TPI threading accepts standard .45 can mounts, and the hard-coat nitride finish delivers dependable corrosion resistance with a crisp slide feel. Designed as a drop-in replacement, it blends effortlessly into your Glock’s slide geometry while unlocking suppressed performance.

Glock Barrel Compatibility: SilencerCo threaded barrels are compatible with the following Glock handgun generations:

• G21: No Gen 5

• Precision-machined 416R stainless construction for strength and accuracy
• .578-28 TPI threads—compatible with most .45 suppressors
• Hard-coat nitride finish increases corrosion resistance and low-friction operation
• Drop-in design for easy installation
• Keeps Glock reliability while enabling suppressor functionality