These o-ring snouts are an upgrade to our Adjustable Rod Guides to give you an even better seal in the chamber. These snouts are of thee same design as the snouts on our solid Delrin one-piece rod guides. Currently available in selected cartridge family sizes (both short and long action) for our .17 thru .25 caliber and 6.5mm thru .30 caliber All-Purpose Rod Guides. If you need help in ordering these please call and talk to one of our Sales Representatives. Snouts also fit the older Stoney Point small and medium rod guides.