ive had the rifle for 4 years and hardly ever have to alter it, just check it when on new ammo and if i havent used it for a while. The other rifle has had its removed and re zeroed and had a successful night out but its abit too early to tell yet, it seems a coincidence that we are both struggling i havent had chance to do anything to mine yet but i have got a different model of the same make of mod to try which has been out along time and gets good reviews, it is bigger and heavier though which is why i didnt choose it first time round. We are both shooting the same rifle a tikka t3 light so