Rusan Q-R adapter M52x0.75 for Ø57 mm (ARM52-57)

What it is and what it's for
The Rusan ARM52-57 is a quick-release (Q-R) coupling adapter designed to mount night-vision or thermal devices that use an M52x0.75 thread onto objectives with a 57 mm outer diameter. It functions as the interfacing piece between the device thread and the objective outer diameter to allow attachment via the ARM52 series.

Features
The ARM52-57 reference belongs to Rusan's ARM52 series and corresponds to the 57 mm variant. It provides an M52x0.75 thread/interface and is specified for an objective outer diameter of 57 mm. The listed weight for the ARM52 series is 0.164 kg. The ARM52 series is offered in multiple outer-diameter variants and includes fitment tables that link each variant to specific sight and clip models.

Compatibility
This adapter requires a device with an M52x0.75 thread and an objective or receiver with a 57 mm outer diameter; both requirements must be met for compatibility. Consult the ARM52 fitment tables to verify compatibility with particular brands and models before purchase.

Precautions
Check the thread pitch (M52x0.75) and the objective outer diameter (57 mm) of your equipment carefully to avoid incompatibilities.