Osuma Pair of Rings for Osuma Base, 40 mm

• 40 mm ring size: Built for 40 mm scope tubes, these rings provide the correct fit for large-body optics and help maintain even clamping without improvised inserts or adapters.
• Made for Osuma bases: The rings are designed as part of the Osuma fixed mounting system, giving a straightforward way to complete a base-and-ring setup with matching components.
• Aluminium construction: The aluminium body keeps weight down while still providing the rigidity needed for a stable riflescope mounting interface on hunting and target rifles.
• Ø 7 mm interface compatibility: Compatibility with EAW, Optilock, Osuma, and Recknagel Ø 7 mm interfaces makes these rings useful for shooters working within established European mounting standards.
• Made in Finland: Finnish manufacture reflects Osuma’s focus on practical scope-mount design, with dimensions and materials chosen for dependable fit in field use.

About the Osuma Osuma Base Rings Series

Osuma Osuma Base Rings are part of the brand’s fixed riflescope mounting system, intended for shooters who want a modular setup built from matching components rather than a one-piece mount. In this series, the rings are designed to attach to Osuma bases, forming a three-part assembly with the base, bottom ring and top ring working together as a complete mounting solution. That approach gives the user flexibility when selecting the correct ring diameter and height for a particular optic and rifle combination.

The series covers several common tube sizes, including 1 inch, 30 mm, 34 mm, 36 mm and 40 mm, and includes low, medium and high variants where available. This makes the range relevant for both traditional hunting optics and larger specialist scopes that require more mounting surface and clearance. Osuma positions the series around practical durability rather than unnecessary complexity, using high-grade aluminium with an anodized surface to keep the rings light, corrosion-resistant and suitable for regular outdoor use. Designed and manufactured in Finland, the series reflects a straightforward mechanical philosophy focused on secure scope alignment, compatibility with Osuma bases and dependable service on sporting rifles.

About the Osuma Pair of Rings for Osuma Base, 40 mm

The Osuma Pair of Rings for Osuma Base, 40 mm is a specialist upper ring set for shooters using a 40 mm scope tube within the Osuma fixed mounting system. This diameter is typically associated with large, heavy-duty optics, so the ring set is aimed at applications where a broad clamping surface and stable support matter as much as simple fit. By matching the ring size to the scope tube exactly, the mount helps distribute clamping force more evenly and supports consistent scope positioning.

Because these rings are made specifically for the Osuma Base platform, they suit users who want to build or service a modular mount with original-pattern parts rather than mixing unrelated components. The listed KR 0.0 mm extension indicates a non-extended configuration, which keeps the ring position neutral and makes sense where the base and optic already provide the necessary eye-relief placement. In practical terms, that gives the installer a clean, direct mounting solution without adding offset that may not be needed.

The rings are made from aluminium and finished in black, a combination that keeps the assembly light and visually unobtrusive on a hunting or sporting rifle. Compatibility with EAW, Optilock, Osuma and Recknagel Ø 7 mm interfaces also broadens their usefulness for shooters working with established European mounting footprints. For maintaining an existing mount or assembling a 40 mm scope setup from matching parts, this ring pair is a purpose-built component rather than a generic substitute.

About Osuma

Osuma is a Finland-based manufacturer focused primarily on rifle scope mounting. The company’s background goes back to the early 1990s, when its owner developed the first mounts for his own hunting and benchrest shooting needs. That origin is still reflected in the product range, which centers on practical mounting solutions for real rifle use rather than broad general accessories.

Over time, Osuma expanded its portfolio to more than 150 products, including scope mounts, scope rings, rail mounts, red-dot and holosight mounts, suppressors and the Trigger Widener accessory. The company has remained a family business, having passed from father to son, and it continues to design and manufacture its products in Finland. Within this category, Osuma is especially known for offering mounts across several common systems, including 11 mm, Tikka 17 mm, Sako, Picatinny, Optilock and Blaser, with aluminium rings that use an anodized surface for durability.

Main Features

• Manufacturer: Osuma
• Series: Osuma Osuma Base Rings
• Made in: Finland
• Material: Aluminium
• Extension (KR): KR 0.0 mm
• Scope / sight type: 40 mm
• Color: Black
• Compatibility above: 40 mm
• Compatibility below: EAW Ø 7 mm Interface
• Compatibility below: Optilock Ø 7 mm Interface
• Compatibility below: Osuma Ø 7 mm Interface
• Compatibility below: Recknagel Ø 7 mm Interface

Warranty

Osuma provides a 2-year warranty for this product. This stated warranty period covers the ring set as a manufactured mounting component.