GrovTec Thread Protector 1/2-28 A robust thread protector engineered to safeguard barrel threads from damage and contamination when a muzzle device is not fitted. Machined for common thread pitches and exterior diameters to preserve thread integrity for long-term service life and maintain precise alignment for future muzzle device installation. Finished in black oxide for corrosion resistance and low reflectivity, the protector uses a 1/2-28 thread pitch and a 0.625 inch outside diameter and fits pencil-barrel profiles. Manufactured in the U.S.A., this protector provides a durable, low-profile solution to keep threads in serviceable condition over the life of the firearm.