$25.00Bull Nose Thread Protector for 1/2-28 threaded barrels. Designed for use with our MAX-11k, this thread protector can be used on any 9mm barrel threaded 1/2-28. 1" O.D. x 1-5/16" long with a knurl to provide an easy grip to install or remove the thread protector. An O-Ring installed in the thread protector seats against the barrel collar and prevents it from loosening or unscrewing during use.