Muzzle Thread Protector

This screw-on sleeve is designed to protect the muzzle threads of certain firearm barrels when no muzzle device is installed. Its circumference is ribbed for grip so that it can be screwed on and off by hand. Supported thread specs are:
- 1/2"-28, commonly used for .223 Remington and similar chamberings
- 1/2"-32, sometimes used for .30-caliber chamberings
- 9/16"-24, commonly used for .40S&W, and sometimes for 6.5 Grendel
- I fitted this to a [Grendel Incursion barrel](https://www.shopa