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Apex Grade Thread Protector
FSLMEIL Thread Protector kit 1/2x28 5/8x24 TPI with Free Crush Washer, All Steel Threaded (4 Pack): Amazon.com: Industrial & Scientific
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
PROTECTORS GROVTEC US, INC. AR BARREL MUZZLE THREAD PROTECTOR 1/2-28 X.700 - Brownells Iberica