The Ruger 90004 Scope Base Set Black Steel is a precision two-piece scope base adapter crafted for the Ruger No. 3 and No. 1 Varminter rifles, delivering a reliable, rigid foundation for your optics with a durable black steel finish. Designed to mount directly to the receiver, this two-piece set ensures solid alignment and repeatable performance, enhancing accuracy potential for varmint hunting and precision shooting workloads. While categorized as a scope base adapter, its robust steel construction provides lasting wear resistance and dependable performance in demanding field conditions, making it an ideal upgrade for shooters seeking a dedicated mounting solution that pairs seamlessly with Ruger platform rifles. The No. 1 Varminter and No. 3 rifles benefit from secure optic mounting, enabling consistent tracking and quick target reacquisition across varied terrain. This Ruger base set emphasizes fit and function, supporting a clean, secure interface between receiver and optic without unnecessary components, and it integrates smoothly into established hunting setups where a dedicated base is required for dependable optic performance.