Went to sight in the AR at the range yesterday and could not get it to zero. It would be 4 clicks left and I'd make a correction and it would be 8 clicks right. Then if I tried for a group it would walk to the left or right, and up or down. Finally I noticed that the crosshairs were beginning to rotate inside the housing. I fired a few more rounds and the crosshairs were a good 15 degrees rotated from vertical/horizontal, but the housing was still straight, hadn't budged. I got home and looked up Vortex Crossfire and discovered that Vortex has a lifetime fix or replace warranty against all damage regardless of cause (except willful abuse), and it is completely transferrable. I also noticed that the scope was in the $250-$300 range on their web pages. I got the rifle from a NWF member with the scope already on it, so I was really pleased to see that the warranty was transferrable. I shipped the scope off to them today, and received this reply to my email about it: If they repair or replace this scope free of charge I'll certainly give them consideration any time I buy optics. I'll post the results here.