Description
The SilencerCo AC863 is a precision drop-in threaded barrel for the Glock 21 Gen3, chambered in 45 ACP. Machined from 416R stainless steel and finished in a low-reflectance black nitride coating, this replacement barrel is built to deliver match-grade accuracy and long service life while giving you a ready-made threaded muzzle for suppressor use.
Measuring 5.30″ overall, the AC863 installs as a direct replacement for the factory Glock 21 Gen3 barrel and requires no fitting. The muzzle is cut with .578×28 right-hand threading, making it compatible with a wide range of 45 ACP pistol suppressors and thread-on muzzle accessories. No sights are included on the barrel itself, allowing it to be used with the host pistol’s existing sight setup.
Whether you are building a dedicated suppressed host or simply upgrading the factory barrel for tighter groups and longer service life, the AC863 brings SilencerCo’s suppressor-ready engineering to your Glock 21 Gen3 pistol.
