Possum Hollow bore guides are machined from a solid piece of delrin. This material is 100% solvent resistant. Our guides are designed to align the cleaning rod with the center of the rifles bore. This insures that no damage can be done by a jag or brush. Our "O" ring guides are machined with a snout that extends into the chamber.
This snout has a silicone "O" ring that seals off the chamber. This insures that no solvent can run back into the action or trigger. Rimfire guides do not have a snout that protrudes into the chamber. We are unable to put a snout on because of the ejector inside the action.