Rusan reducing ring for FNA

• M52x0.75 to M45x0.75 reduction: this ring converts the standard Rusan adapter-side thread to the thread used by compatible FNA HLM clip-on devices, making it possible to integrate the device into a proven adapter setup.
• Built for thermal clip-on systems: the ring is made specifically for clip-on use, so it supports a secure mechanical connection between the day scope adapter and the thermal attachment rather than serving as a generic workshop spacer.
• Counter nut included: the supplied counter nut helps secure the ring in the correct position, which is useful when maintaining consistent alignment on a clip-on assembly.
• Wrench included: the included tool simplifies installation and removal, so the ring can be fitted correctly without improvising with unsuitable tools.
• Modular Rusan compatibility: used together with the appropriate Rusan Q-R adapter, this reducing ring forms part of a flexible system that lets a clip-on device be matched to the correct riflescope adapter size.

About the Rusan Accessories Series

Rusan Accessories is the part of the Rusan range dedicated to the practical connection points that make clip-on systems work in the field. The series covers adapters and reduction rings for attaching night-vision and thermal clip-on devices to riflescopes, alongside related mounting components. A key idea behind the range is flexibility: rather than treating every optic and every clip-on as a closed system, Rusan builds around adapter solutions that let users match the correct interface to the device and the riflescope.

Within the broader lineup, the series includes both conventional and modular adapter systems. That gives shooters a choice between straightforward dedicated setups and more adaptable configurations for sharing one clip-on device across multiple rifles or combining different devices with different optics. The family is therefore aimed at hunters and other users who need a secure, repeatable connection without replacing an entire mounting solution each time the host optic changes. In practice, the accessories series is defined less by electronics or optics than by precise thread standards, solid metal construction, and compatibility across a wide range of clip-on platforms.

About the Rusan reducing ring for FNA

The Rusan reducing ring for FNA is a dedicated interface part for users who need to connect a compatible FNA HLM clip-on device to a Rusan adapter system. Its job is specific but important: it reduces the thread from M52x0.75 on the adapter side to M45x0.75 on the device side, allowing the clip-on to be integrated into a conventional Rusan setup. For thermal clip-on use, that kind of correct thread matching matters because it affects how securely the device mounts and how consistently the assembly can be positioned.

This model is intended as a component rather than a complete adapter on its own. It is designed to be combined with the appropriate Rusan Q-R adapter, selected to match the day scope, so the user can build a complete clip-on mounting solution around the thread standard required by the FNA HLM. That approach is especially useful when a clip-on device uses a different thread than the base adapter system, because it avoids replacing the entire mounting arrangement.

Practical details also reflect field use. The ring comes with a counter nut to help secure the assembly and a wrench for proper installation. Finished in black and made for thermal clip-on applications, it is a purpose-built accessory for shooters who need a clean mechanical transition between the Rusan adapter platform and a device with M45x0.75 thread.

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. Željko Rusan opened a gunsmith shop in 1986, and the company began producing scope mounts in 1993. That background still defines the brand today: Rusan focuses on precision-made mounting solutions and related firearm components rather than general outdoor optics.

The company’s range includes scope mounts, scope rings, Picatinny rails, firearm tuning products, and adapter systems for clip-on devices. Rusan is particularly well known for products that connect riflescopes with night-vision and thermal-imaging devices, including adapter clamps and reduction rings for different thread standards. Its original clip-on sight adapter clamp entered the global market in 2009, establishing the company as a specialist in the mechanical side of clip-on integration for hunting optics and shooting equipment.

Main Features

• Manufacturer: Rusan
• Series: Rusan Accessories
• Made in: Croatia
• Accessory for: Thermal Clip-on
• Color: Black

Warranty

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

In the Box

• Rusan reducing ring for FNA (HLM) - M45x0.75
• Counter nut
• Wrench