The Spuhr HPC30-30D Cantilever Interface Rings are premium, modular optics mounting rings engineered for 30mm scope tubes on traditional bolt-action or long-action hunting rifles. Meticulously machined from high-strength 7075-T651 billet aluminum, they balance an incredibly lightweight 4.0-ounce profile with durability that outperforms standard construction steel. This paired system utilizes one standard rear ring alongside a specialized cantilever front ring that delivers a 0.94-inch forward offset to optimize eye relief flexibilty over extended actions. Setting this Interface variant apart, the architecture features dual Spuhr Interface top covers to securely run secondary tactical gear or backup reflex sights at multiple angles. Utilizing Spuhr’s signature 45-degree diagonal splits for unobstructed turret visibility, the base assemblies integrate reversible side clamps to seamlessly support both left- and right-handed configurations. Spuhr Picatinny Cantilever Interface Rings 30mm 1.18"Height HPC30-30D in Matte Black