Rusan reducing ring for FNA 052

• M52x0.75 to M50x0.75 thread reduction: lets a clip-on device or accessory with an M50x0.75 interface work with a Rusan M52x0.75 adapter system, so an existing setup can be adapted without replacing the whole mounting solution.
• Built for thermal clip-on use: made specifically for clip-on applications, helping integrate compatible thermal devices into a riflescope adapter setup while keeping the connection simple and purpose-specific.
• Accessory for the FNA 052 platform: suited to the HLM (Polovacky) FNA 052 and other devices with the same thread pattern, which makes it a practical fit when matching less common device threads to standard adapter components.
• Works with the Rusan Q-R adapter system: functions as part of a larger adapter assembly, allowing the user to combine the correct reducing ring with an appropriate Rusan Q-R adapter for the riflescope objective size in use.
• Wrench included: simplifies installation and removal, which is useful when setting up or changing a clip-on configuration in the workshop or before a hunt.

About the Rusan Accessories Series

Rusan Accessories is the supporting hardware range behind the company’s clip-on mounting systems, with a strong focus on adapting night-vision and thermal clip-on devices to riflescopes in a practical, repeatable way. The series covers both conventional and modular adapter systems, giving users a choice between a straightforward fixed solution and a more flexible setup that can be shared across multiple rifles or paired with different clip-on devices.

A defining trait of the series is its emphasis on compatibility. Alongside complete adapters, the range includes reduction rings, connectors, and spare parts that solve the small but important interface differences between devices and mounting systems. That matters in real use because clip-on equipment often depends on precise thread standards and secure alignment. The series grew out of Rusan’s long involvement with clip-on mounting solutions, including its original adapter concept introduced to the global market in 2009. In practice, the Rusan Accessories family is aimed at hunters and other users who need a dependable way to connect thermal or night-vision equipment to daytime optics without unnecessary complexity.

About the Rusan reducing ring for FNA 052

The Rusan reducing ring for FNA 052 is a small but important interface part for clip-on mounting systems. Its job is specific: it converts an outer M52x0.75 thread to an inner M50x0.75 thread, allowing compatible devices such as the HLM (Polovacky) FNA 052 to be integrated into a Rusan adapter setup. For users working with thermal clip-on equipment, that kind of thread conversion is often the difference between a clean, secure installation and a setup that simply cannot be assembled.

This accessory is not a complete adapter on its own. Instead, it is designed to work as part of a broader mounting solution, to be combined with a Rusan Q-R adapter in the correct size for the day scope. That modular approach is practical because it allows the thread standard on the device side to be matched correctly while the riflescope side is selected separately according to objective diameter. The result is a more tailored clip-on configuration rather than a compromise fit.

The ring’s black finish keeps it visually discreet alongside modern hunting optics and thermal equipment, while the included wrench helps with fitting and removal. In use, this is the kind of accessory that supports a precise, orderly clip-on system: not by adding features of its own, but by ensuring the main components can be joined correctly and securely.

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’s development in shooting accessories grew through gunsmithing and mount production, with Željko Rusan opening a gunsmith shop in 1986 and the company beginning scope-mount production in 1993. Today, Rusan is known for making scope mounts, scope rings, Picatinny rails, adapter clamps, and firearm tuning products.

Within the optics field, Rusan is especially associated with hardware for attaching night-vision and thermal-imaging devices to riflescopes. Its original clip-on sight adapter clamp was introduced in 2009, and that focus on practical mounting solutions remains central to the brand. For products such as reducing rings and clip-on adapters, Rusan’s reputation rests on machining experience, compatibility across many optic and rifle platforms, and a product range built around real mounting requirements rather than generic accessories.

Main Features

• Manufacturer: Rusan
• Series: Rusan Accessories
• Made in: Croatia
• Accessory type: Reducing ring for thermal clip-on devices
• Compatibility: HLM (Polovacky) FNA 052 and other devices with the same thread type
• Thread conversion: M52x0.75 (outside) to M50x0.75 (inside)
• Color: Black

Warranty

2 years. This Rusan accessory is covered by a two-year warranty.

In the Box

• Rusan reducing ring for FNA 052
• Wrench