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The 30mm tube on these devices is used as a means of mounting when attaching them to a firearm. Typically, the mounting area is divided by the turret section, just like in conventional riflescopes.
The 30mm tube mounting standard on Pulsar Thermion 2 XP50 Pro
To attach these thermal scopes to a rifle, 30mm rings are required.
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Mounting Standard
*named Mars instead of ThOR in the EU.