Abstract: A bore jag, having a tapered tip at one end, the opposite end of the bore jag being releasibly connectible to an end of a barrel cleaning rod, and frusto-conical barbs distributed along the bore jag for retaining engagement with a cleaning cloth. A bore jag guide in the form of an O-ring extends around the bore jag for sliding engagement with the bore of a rifle barrel as the bore jag is drawn along the rifle barrel bore. The bore jag guide comprises a material which is sufficiently soft to avoid damage to the rifle barrel bore by the sliding engagement of the bore jag guide therewith, and the bore jag guide being so dimensioned as to support the remainder of the bore jag out of contact with the rifle barrel bore during the travel of the bore jag along the rifle barrel bore.