To be honest never purchased one but have seen a few on rifles brought to me when the owner need help after initial attempt to zero proved unsuccessful. Using a collimator type bore sighter I noted massive point of the no act shift as magnification power was wound up and down on some of them, so I had no success trying to zero them either. Tried a couple different on rifles of known accuracy and had just as poor results as the guns they came on, I’m sure some one will say they have one and it’s great, but it’s purely a quality control or design issue and they seem to have a fairly high failure rate. My advice would be test or use it on something that uses cheap ammo rather than expensive stuff to find out if it’s any good run a test once zeroed to see if the point of impact changes when u run the zoom up or down it’s not the end of the world if it does you may just have to pick a favourite magnification setting and leave it on that.
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