I have a pro stalk 4-14 x 50 on my hw97k with no problems at all but im on my 3rd reflex 4-10 x 44 on my hw80k the previous one the front lense fell to bits and the 1st one the retical lense came loose this was over a considerable time so you can imagine my frustration when my shots were going all over the place and i thought it was me