Leupold steel Quick-Release (QR) rings and bases are designed to make removing and replacing your optic effortless, while maintaining zero within +/- �� MOA. This model, specifically made for the Kimber 8400, is a popular choice for muzzleloaders and large caliber rifles. The QR system features a patented lever mechanism, precision-machined to engage the steel base by pulling the ring down and forward, locking it securely in place. This system allows for the use of multiple scopes on a single rifle, making it especially convenient for hunters and shooters who travel by air and prefer to remove their scope for transport. Both the 1-piece and 2-piece QR bases accept all QR rings, ensuring reliable accuracy and ease of use in the field. Built as tough as the Leupold optics they secure, these mounts provide the critical link between your scope and firearm, ensuring performance you can trust. Made in the USA and built to endure a Lifetime of use, Leupold mounts deliver the rugged dependability needed for every shot.