Since each firearm manufacturer has their own proprietary mounting rail design, each ring model must be machined to exacting tolerances for proper fit and function. Because of this, Warne Ruger Rings are able to fit right onto the receiver's dovetail with no need for a mounting base. It has a Ruger-specific scalloped recoil control key for positive engagement of ring to receiver dovetail, and utilizes four T-15 Torx style socket cap screws for secure and permanent optics mounting. This fixed ring set fits the tapered receiver style of the Ruger M77, Hawkeye, and Super Redhawk, and is packaged as two different heights to accommodate the tapered mounting surface on this firearm.