This mounting standard (M44x0.75) was first used by Swarovski on their TM35 thermal clip-on. Most mounting solutions on the market consist of an M52x0.75 adapter and a reducing ring, only a few are one-piece versions. All the clip-ons that feature this mounting standard are front-mounted, meaning that they are mounted on the riflescope’s objective.
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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
Our article with all the mounting standards on NV and thermal clip-on devices is available here