Description Leupold steel Quick Release (QR) rings and bases make it easy to remove your optic from your firearm and replace it, all while maintaining zero (+/- MOA). This specific ring model fits any riflescope with a 30mm maintube and is meant to be paired with our Dual Dovetail bases. It is especially popular for muzzle loaders and large caliber rifles. The QR mounting system uses a patented lever mechanism, machined with precision tolerances, that engages the steel base to the ring by pulling it down and forward, locking it into place. This easy-to-use system allows you to use multiple scopes on one rifle, making it a great choice for hunters and shooters who travel by air and wish to remove their scope from their firearm. Our QR 1-piece and 2-piece bases accept all QR rings and provide you with the convenience and field-proven accuracy you expect from a mount. Specifications and Features: Type: Ring Single Tube Diameter: 30mm Height: 0.77″ Size: Accepts up to 42mm Finish: Matte Style: Quick Release Material: Steel Mount Type: Dual Dovetail WARNING This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. www.p65warnings.ca.gov Shipping & Returns Reviews