Silencerco Threaded Barrel for Glock 21 .45 ACP 5.2 Inch Barrel .578x28 Threads Black Nitride Finish Out of stock. Check back later... Price: $178.33 Notify me when this item is back in stock (log in required) Description Details Reviews Shipping info Constructed using 416R stainless steel with black Nitride finish. UPC: 817272012019Manufacturer: SilencercoModel: AC863SCaliber: 45ACPCategory: PartsOtherBarrelsStock: 0Unit/Measure: ea This item may be shipped directly to your home address, unless you live in a restricted state.