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 ring model fits any riflescope with a 30mm maintube and is meant to be paired with our Quick Release 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 dow