Rusan Q-R adapter M52x0.75 for Ø66 mm (ARM52-66)

What it is and what it does

The Rusan ARM52-66 is a quick-release (Q-R) clamping adapter to mount night-vision or thermal devices with an M52x0.75 thread onto the objective of a daytime riflescope. It is intended for units with an M52x0.75 thread and for objectives with an external diameter of 66 mm within the ARM52 series.

Key characteristics

This is the -66 option of the ARM52 family, designed for objectives with a 66 mm external diameter. It uses the ARM52 Conventional clamping system and is compatible with devices featuring the M52 x 0.75 thread. The documented weight of the adapter is 0.164 kg.

Compatibility

The manufacturer lists direct compatibility with several night-vision models, including Dedal 540/541/542/546/552; Jahnke DJ-8 NSV; and Lahoux D-545 and LV-81. It can also be used with reduction rings to fit other models as indicated in the official compatibility table.

Usage notes

For Dedal 552 and Lahoux D-545 (large eyepiece) it may be necessary to use the ERD552 extension ring when fitting to small daytime scopes (less than x42). Thread M52x0.75 and the 66 mm diameter are the reference dimensions that determine compatibility.