Leupold steel Quick Release (QR) rings and bases are designed to give you the convenience of easily removing and reattaching your optic while preserving zero with exceptional accuracy (+/- 1/4 MOA). This specific model is tailored for the Browning AB3 rifle and is commonly used with muzzleloaders and large-caliber rifles, offering a secure and reliable mounting solution for a variety of shooting needs. The QR system features a patented lever mechanism that is machined with precision tolerances. This mechanism locks the steel base and ring into place by pulling it down and forward, ensuring a firm connection. The system is simple to use and allows you to switch between multiple scopes on the same rifle, making it ideal for hunters and shooters who travel by air and want to quickly remove their scope without worrying about losing zero. Leupold's QR 1-Piece and 2-piece bases are compatible with all QR rings, providing unmatched convenience and field-tested accuracy. When it comes to the link between your scope and firearm, nothing is more important and Leupold's mounts deliver the rugged dependability you need. With a wide variety of mounting systems available, you're sure to find the perfect match for your firearm and shooting style. Proudly made in the USA and built to withstand a lifetime of use, Leupold mounts are guaranteed to perform and will never let you down.