The Leupold 1-Piece Quick Release Base provides a stable platform to attach your mount and scope. The machining is made for super-close tolerances, creating the soul of this lever mechanism patented by Leupold. This is what pulls down the ring and moves it forward onto the base, thereby locking it into a solid zero position. Built from solid metal, this base makes attaching your scope simple and quick. The positioning allows for more precise sightings and simpler alignment when you are using your firearm.