Update on mine the scope and rings that come with it are allowing it to shift. I'm going to have to upgrade that. I'm not sure why they are moving around I have them tight almost to the point of stripping the screws. Obviously they are not the best quality but I thought they would hold up to air rifle vibration/recoil with no issues.
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that's why I switch scopes on my benjamin np2. The nitro piston impact, would constantly move my scopes post of aim. I read that center fire rifle scopes are designed for recoil shock. Also loctite on the mounting screws may help