Yankee Hill Machine 9mm Thread Protector, 1/2x28, .570 OD, Black Matte - YHM-3418-B

This steel thread protector is designed to prevent damage to the threads of your 9mm pistol barrel when a muzzle device is not installed. It features a 1/2x28 thread pitch with a .570 outer diameter and matte black finish. Simply screw onto the barrel threads for protection during storage or transport.