TFB REVIEW: Threaded Barrels From Backup Tactical -The Firearm Blog
Double Diamond Thread Protector | Best Glock Accessories | GlockStore.com
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