I bought a Leupold VX-III 6.5-20x40 and had to return it. It, like other high end scopes, have a longer eye relief than less expensive scopes. On my BM Varminter, even with the armalite scope mount, had problems with too much eye relief. I had to move my head way back to see throught he scope. I bought a cheaper ($230) Bushnell Trophy 6-18 and it works great. I own 3 Leupold scopes and will swear by them, but they just didn't work on my gun.
Mark