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The Sinclair Two-Piece bore guide system facilitates optimal alignment of the cleaning rod with the bore. It comprises of two guides - a guide body and a separate guide that when combined, ensure that the rod is securely centered within the barrel. The guide body is inserted into the action and creates a seal with the chamber using an O-ring, thereby functioning like a traditional bore guide. The additional guide is then inserted into the rear of the guide body to provide a snug fit for the cleaning rod. An 8" insert further secures the rod, preventing flexing and prohibiting contact with the rifling while cleaning. The Delrin machined guide body and insert are designed with rubber O-ring seals to prevent any solvent from seeping into the action. The bore guide fits the Remington 700 and similar rifles with a .700" diameter bolt. The insert can be purchased separately and should be chosen to match the diameter of one's cleaning rod.