The Tipton universal bore guide will help protect the bore and action of your rifle by properly aligning the cleaning rod and reducing solvent overflow. Cleaning without a bore guide can allow the rod to bow and rub or gouge the chamber and throat of the bore, causing real damage and loss of accuracy. Keeping the rod properly aligned not only protects your barrel, it directs the force exerted on the cleaning rod handle allowing tight patches to be pushed more easily. Fits most bolt action rifles & AR-15s Protects chamber & bore from damage Ensures proper rod alignment for easier cleaning Reduces solvent leakage into gun's action Anodized aluminum tube for durability Integrated solvent port Inserts & secures into the bolt position Simply switch between tip attachments to configure the size Small attachment fits most up to 6mm (.17-.24 caliber) Medium attachment fits most to 6.5mm- 7.62mm (.25-.30 caliber) Large attachment fits most over 7.62mm (over .30 caliber) AR-15 collar attachment for receiver fitment