The Dewey Rod Guide is designed without a chamber sealing o-ring due to space constraints, but includes a front brass bushing for centering in the barrel extension.
It features a large o-ring at the back end to lock into the bolt opening, minimizing movement during cleaning.
Constructed from Delrin, Brass, and Anodized Aluminum, it is compatible with J. Dewey Cleaning Rods and comes with spare O-rings and an installation tool.