The Glock 21 compatible threaded barrel from Silencer Co is a 4.6 inch replacement barrel made from 416R stainless steel. This barrel features a black finish along with a .578″ x 28 RH thread pattern.
SilencerCo AC863 Threaded Barrel45 ACP 4.60″ fits Glock 21 Black 416R Stainless Steel
