This is a bayonet-type mounting standard that consists of three notches. The adapter is mounted on the bayonet by inserting the adapter pins into the notches and turning the adapter clockwise. Hikmicro uses this standard on all its thermal clip-on devices. There are both one-piece and two-piece mounting solutions on the market, but two-piece ones are much more common. The usual combination is an adapter for the M52x0.75 mounting standard and a Hikmicro Thunder mounting standard converter. All the clip-ons that feature this mounting standard are front-mounted, meaning that they are mounted on the riflescope’s objective.
Hikmicro Thunder mounting standard on HikMicro Thunder Pro TE19C
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With Smartclip, Rusan, Recknagel, and Präzise Jagen adapters you need to choose the size based on the outer objective diameter of the riflescope.
Our list of riflescopes and their outer objective diameters is available here
Rusan reducing ring for the Hikmicro Thunder mounting standard can be paired with Rusan, Smartclip and Recknagel adapter for the M52x0.75 mounting standard.
Our article with all the mounting standards on NV and thermal clip-on devices is available here