the only leopolds that i ever have trouble with is ones from pawn shopes, i then send them to oregon and get fix on warranty, usally i am aware of the problem and know i can make a good profit when they are fixed.. my 300 wearas the same 3.5x 10 it started with 10 yrs ago.. never skipped a beat, and this is a stainless /synthetic that is light and rocks the boat