This is a Pro-Shot Products Mop known as the Mop, model MP20.
Pro-Shot Rifle" Shotgun" and Pistol bore mops are 100% cotton and manufactured with a brass core and looped end. They are manufactured of the highest quality construction possible. Mops are especially excellent when using oil for bore lubrication because they create foaming action that helps in the lubrication process. Mops can be used for quick cleaning and bore lubrication.
Features:
20 & 28 Ga. Mop
