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2pcs Barrel Thread Protector 1/2"-28 Or 1/2-20 For 9mm Ar-15 Ruger 10/22 Glock Beretta Sig! - Scope Mounts & Accessories - AliExpress
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SilencerCo AC1360 Thread Protector 9mm Luger Black Steel 1/2"-28 tpi AR-Platform | Armory Outfitters
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Standard barrel thread protector 1/2″ x 28 thread smooth finish Stainless 3/4″ long – Down Range Products Company
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