Are you familiar with how tough those barrels are? I'm sure that landing on the ground after being thrown out of a turret is not quite the same as being tossed in a plastic barrel at weird angles.
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As is evidenced by the video below, a barrel can be an exceptionally harsh environment.
https://youtu.be/aD8OO-DDLFU
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My front lever backs out a smidge after half a mag or so, no matter how its adjusted, but doesnt seem to affect zero. Its nothing amazing but not bad. I'd rather have another ADM or Geissele though.