Sinclair cleaning rod guides are designed to insert into your action in place of your bolt. Silicone O-ring seals the barrel off from the receiver preventing solvents from leaking back into the action area and gumming up the trigger assembly. These specialty rod guides also protect the accuracy critical throat and the cleaning rods from having the protective coating scratched off. Each rod guide is machined to fit specific actions and cartridge families and features a mess-free solvent port.