Osuma Single Ring for Osuma Base, 30 mm

• 30 mm scope fit: Sized for 30 mm scope tubes, this ring gives a secure, correctly matched clamping surface that helps maintain alignment and reduces the risk of tube stress during installation.
• Osuma Base interface: Built for the Osuma Base system and compatible with Ø 7 mm interfaces used by Osuma, EAW, Optilock and Recknagel-style bases, it offers a practical way to complete or replace part of a fixed mounting setup.
• 0 MOA configuration: With 0 MOA inclination, the ring keeps the optic in a neutral mounting position, making it a sensible choice for general hunting and sporting rifles where added cant is not required.
• Compact fixed-mount design: As a single ring for a modular fixed mount, it suits repairs, custom setups and one-for-one replacement without having to buy a complete ring set.
• Made in Finland: Designed and manufactured in Finland, with an anodized finish associated with the Osuma ring family, it is built for regular field use and consistent fit in a precision-machined mount system.

About the Osuma Osuma Base Rings Series

Osuma Osuma Base Rings are part of the brand’s classic fixed-mount system, built to attach directly to Osuma bases as a modular three-part arrangement of base, bottom ring and top ring. That layout gives shooters a practical way to configure a mount around the rifle and optic they already use, rather than relying on a one-size-fits-all solution. Within the series, Osuma offers ring sizes from 1 inch to 40 mm, with height options that vary by tube diameter, so the range covers everything from compact hunting scopes to larger target or specialist optics.

The series sits in Osuma’s core mounting lineup and reflects the company’s emphasis on straightforward, durable scope mounting for hunting and shooting use. Osuma describes these rings as made from high-grade aluminum with an anodized surface, combining low weight with the corrosion resistance expected from a field rifle accessory. The system is intended for use with Osuma bases for 11 mm, 17 mm, Sako and Picatinny interfaces, which makes the series flexible across several common rifle platforms while keeping the mounting concept simple and mechanically consistent.

About the Osuma Single Ring for Osuma Base, 30 mm

The Osuma Single Ring for Osuma Base, 30 mm is a modular upper mounting component made for shooters who need a precise replacement part or want to complete a fixed mount around an existing base system. Its defining feature is the 30 mm internal diameter, which matches one of the most common riflescope tube sizes used in hunting optics and target scopes. A correctly sized ring matters in practice because it supports even clamping pressure around the scope tube, helping preserve alignment and reducing the chance of unnecessary stress on the optic body.

This model is configured with 0 MOA inclination, so it keeps the scope in a neutral position relative to the rifle. That makes it well suited to conventional hunting and general sporting applications where extra elevation cant is not needed. The ring is intended for the Osuma Base platform and fits the Ø 7 mm style interface used by Osuma as well as compatible EAW, Optilock and Recknagel base patterns. In practical terms, that gives the user more flexibility when replacing a damaged ring or building a mount from compatible components.

Finished in black and made in Finland, this single ring follows Osuma’s straightforward design approach: simple geometry, fixed-mount stability and compatibility with established European base systems. For a rifle setup that already uses the Osuma Base concept, it is a focused, purpose-built part rather than a universal compromise.

About Osuma

Osuma is a Finland-based brand focused primarily on rifle scope mounting. Its history goes back to the early 1990s, when the owner began developing scope mounts to meet his own hunting and benchrest shooting needs. That practical origin still shows in the company’s product range, which centers on solving real mounting and shooting problems with simple, durable hardware.

The brand designs and manufactures its products in Finland, and its lineup extends across scope mounts, scope rings, rail mounts, red-dot and holosight mounts, suppressors and accessories such as the Trigger Widener. Osuma scope rings are known for their aluminum construction and anodized surface, reflecting the company’s preference for low weight, corrosion resistance and clean machining. The business has passed from father to son, and its catalog now includes more than 150 products for hunters and shooters using a wide range of rifle and optic platforms.

Main Features

• Manufacturer: Osuma
• Series: Osuma Osuma Base Rings
• Made in: Finland
• Warranty: 2 years
• Extension (KR): KR 0.0 mm
• Inclination: 0 MOA
• Scope / sight type: 30 mm
• Tube diameter: 30
• Bubble level: No
• Color: Black
• Compatibility above: 30 mm
• Compatibility below: EAW Ø 7 mm Interface, Optilock Ø 7 mm Interface, Osuma Ø 7 mm Interface, Recknagel Ø 7 mm Interface

Warranty

Osuma provides a 2-year warranty for this product. That stated period matches the warranty information given for Osuma products and suits a precision-machined mounting component intended for regular field and range use.

In the Box

• Single ring