I just had a Crossfire 8X32X50AO go belly up on me. I had it mounted on a 204 Ruger AR and it got real squirrely when I made windage and elevation adjustments and then would just flat NOT hold a zero or group worth a hoot. I called Vortex and am sending it back to them to be looked at. I've had it about 18 months and had no issues up until now.