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 (+/- ¼ MOA). This specific model is for a Browning X-Bolt and are a popular choice 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 u