KleenBore Muzzle Guard,protect the barrel’s crown from accuracy affecting damage. ✔NEW ✔Low Price ✔U.S. Shipping ✔Authorized Dealer A KleenBore Muzzle Guard is an essential tool for properly cleaning firearms from the muzzle. Protecting the barrel’s crown from accuracy affecting damage caused by rod drag or rod strike, our Muzzle Guards simply and effectively provide the necessary protection.The muzzle guard centers the cleaning rod in the barrel while preventing the cleaning rod from dragging or striking the crown during cleaning. Simply slide the guard onto the cleaning rod before your brush, jag, or mop. and you are ready to safely clean your firearm from the muzzle.Handgun/Rifle Muzzle Guards fit .203″ diameter rods.Shotgun/Blackpowder Muzzle Guard fits 5/16″ diameter rods.