Shop › GROVTEC THREAD PROTECTOR AR 1/2-28 GROVTEC THREAD PROTECTOR AR 1/2-28 $12.56 GrovTec GTHM245, Thread Protector, Black Oxide Finish, Black, 1/2X28" Threaded, .705" Diameter, Fits Most AR Barrels GTHM245 Quantity: Add To Cart Added! GrovTec GTHM245, Thread Protector, Black Oxide Finish, Black, 1/2X28" Threaded, .705" Diameter, Fits Most AR Barrels GTHM245