my vortex viper 3-9x40 scope does not move or loses zero with these rings on my 30-06, 2700 fps 180 gr or shotgun, 1600 fps 1oz slugs.

heavy duty construction, the levers lock tight and don't loosen off. repeatable accuracy.

excellent value.

https://encrypted-tbn0.gstatic.com/i...VnjDou-L8ROiVw