This mounting standard is used by Meopta on their Meonight 1.1 analog night vision clip-on device. Other well-known clip-on manufacturers, such as Lahoux, also use it on some of their devices. The adapters for this standard are made exclusively in two-piece versions; most commonly, an adapter made for the Dedal standard (M52x0.75) is paired with a reduction ring (converter) for the Meopta Meonight 1.1 mounting standard (M46x0.75). 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
Rusan reducing ring for the M46x0.75 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