1. The SINCLAIR INTERNATIONAL O-Ring Rod Guide is designed to seal the barrel from the receiver, preventing solvent leakage into the action area.
2. It is compatible with a range of cartridges and actions, including .243 Winchester and McMillan Tactical, with a .720" bolt diameter.
3. Upgraded versions now include integral solvent ports, with custom options without ports available upon request at no extra charge.

Our Centerfire Cleaning Rod Guides are designed to insert into your action In place of your bold or bolt carrier. They feature a snout with a silicone "O"-ring that inserts into your chamber, sealing the barrel off from the receiver. The "O"-ring prevents solvents from leaking back into the action area and gumming up the trigger assembly. We currently stock "O"-ring rod guides for over 1000 different action/cartridge combinations. Each rod guide is machined to fit specific actions and cartridge families from .17 up to .338 caliber. Unfortunately some rifle chamberings do not lend themselves to an "O"-ring style rod guide, for these cartridges we recommend one of our Adjustable Cone Style Rod Guides. In an effort to better serve the cleaning needs of our customers, we have upgraded our Sinclair "O"-ring rod guides to include integral solvent ports. This upgrade is now included with every centerfire bolt action rod guide and nearly all AR style rod guides. If you prefer a rod guide without an integral solvent port, please contact us via e-mail or phone and we will happily provide you with a rod guide to your liking. These rod guides without solvent ports will be treated as semi-custom, so please allow 2-4 weeks for delivery of rod guides without solvent ports. There is no additional charge for rod guides without integral solvent ports. Will fit the following Actions:  Enfield SMLE (No. 1 Mk 4 etc) NOTE: Measure across around area of bolt about in middle with set of dial calipers. Contact Sinclair Reloading tech for proper rod guide.