NDZ Black and Silver Thread Protector for 1/2x28 Threaded Pistol Barrels
Barrel Cover Thread Protector for Pistol
Amazon.com : Lethal-Eye Glock Barrel Thread Protector 1/2x28 Black 9mm 357 Sig 11mm Length, fits Lone Wolf and Other Threaded Barrels : Sports & Outdoors
Barrel Cover Thread Protector for Pistol
Thread Protector | Blacklist Industries
Apex Grade Thread Protector
Custom Thread Protector | Best Glock Accessories | GlockStore.com
STRIKE INDUSTRIES BARREL COVER THREAD PROTECTOR FOR PISTOL BLACK - Brownells Iberica