1" Ruger 77 Quick Detach Rings High Matte Finish by WARNE SCOPE MOUNTSMaxima Grooved Receiver Line is designed to fill the need of mounting scopes to rifles with an integrated receiver mounting rail. Since each firearm manufacturer has their own proprietary mounting rail design and each ring model must be machined to exacting tolerances for proper fit and function. These Warne rings fit right onto the receiver’s dovetail with no need for a mounting base. Front Ring Height .590" Rear Ring Height .720"