Rusan reducing ring for FNA 054

• Thread Conversion for FNA 054: Changes an M52x0.75 interface to M40x0.75, allowing the HLM FNA 054 and other matching-thread devices to be integrated into a Rusan clip-on mounting setup.
• Built for Modular Clip-On Use: This reducing ring is intended for thermal clip-on applications, making it easier to adapt a device with one thread standard to a riflescope adapter system built around another.
• Counter Nut Included: The supplied counter nut helps position the ring correctly in the assembly, which is useful when setting up a clip-on device so the adapter interface sits consistently.
• Wrench Included: The included wrench supports straightforward installation and removal, reducing the risk of improvised tools marking the finish or damaging the threads.
• Compact Metal Accessory: Finished in black and made for a simple mechanical role, the ring adds the required thread interface without unnecessary bulk, which helps keep a clip-on setup tidy and practical.

About the Rusan Accessories Series

Rusan Accessories is the supporting hardware range behind the company’s mounting and adapter systems for hunting optics and observation devices. The series covers adapters and reduction rings for night-vision and thermal clip-on devices, along with related parts that help connect different thread standards, ocular interfaces and mounting components into one workable setup. In practical terms, this is the part of the Rusan catalogue that lets users solve compatibility issues without replacing an otherwise suitable adapter or optic.

A defining characteristic of the series is its support for both conventional and modular adapter systems. That matters for shooters who want to move one clip-on device between several riflescopes, or who need to match different devices to different optics while keeping the mounting logic consistent. Alongside reduction rings and adapter accessories, the wider family also includes mounting rings and rails, so the series fits naturally into Rusan’s broader approach to riflescope and clip-on integration. For users of thermal and night-vision equipment, the emphasis is on practical compatibility, repeatable fit and system flexibility rather than unnecessary complexity.

About the Rusan reducing ring for FNA 054

The Rusan reducing ring for FNA 054 is a purpose-built accessory for adapting a thermal clip-on device with an M40x0.75 thread requirement into a setup based around an M52x0.75 interface. Its role is simple but important: it creates the correct thread transition so the clip-on can be incorporated into a Rusan adapter arrangement without forcing an incorrect fit or relying on improvised solutions. For users working with the HLM FNA 054, that means a cleaner and more dependable way to connect the device to the rest of the mounting system.

Because this is only a thread reducing ring, it is best understood as one part of a larger clip-on solution. It does not replace the main day-scope adapter; instead, it allows the device side of the system to match the required thread standard before being combined with the appropriate Rusan Q-R adapter for the riflescope. That modular approach is useful in the field because it lets the user build a setup around the exact clip-on and optic combination rather than being limited to a one-piece format.

The included counter nut and wrench add practical value by helping with correct installation and alignment. In a clip-on system, secure threading and consistent positioning matter because they affect how neatly the device integrates with the optic and how easily the setup can be assembled again after removal. Finished in black and made for thermal clip-on use, this ring is a small but essential part for anyone building a compatible FNA 054 mounting solution.

About Rusan

Rusan-Mikron is a Croatian manufacturer based in Marija Bistrica, with roots in the Rusan family’s metalworking business dating back to 1983. The company entered scope-mount production in 1993 and has since built its name around precision-made mounting solutions for sporting and shooting optics. Its catalogue includes scope mounts, scope rings, Picatinny rails and firearm tuning products, with a particularly strong presence in adapter systems for clip-on devices.

Rusan is especially well known for products that connect riflescopes with night-vision and thermal-imaging devices. The company introduced its clip-on sight adapter clamp in 2009, and that focus on practical compatibility remains central to the brand. For users of hunting optics and thermal accessories, Rusan’s reputation rests on straightforward mechanical design, broad model compatibility and a product range built around solving real mounting and interface problems.

Main Features

• Manufacturer: Rusan
• Series: Rusan Accessories
• Made in: Croatia
• Accessory Type: Reducing ring
• Accessories for: Thermal Clip-on
• Color: Black
• Thread Conversion: M52x0.75 (outside) to M40x0.75 (outside)
• Compatible Device: HLM (Polovacky) FNA 054 and others with this thread type

Warranty

2 years. Rusan states a 2-year warranty for this accessory.

In the Box

• Reducing ring
• Counter nut
• Wrench