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
Customer Supplied Barrel Work - Barrel threaded, chambered, & muzzle threaded - Patriot Valley Arms
SilencerCo Threaded Barrels: Beretta, Glock, H&K, and more...
1/2 x 28 to 5/8 x 24 Barrel Thread Adapter With Thread Protector Stainless #4244 – Down Range Products Company
Muzzle Threading — Don't Remove Too Much Steel « Daily Bulletin