I had a Big Nikko MK1 which was ok, I had ranging problems in differing temperatures and changed it for a Sightron. It's lighter, brighter, sharper, has a lovely shallow DOF and ranges very well. If I had to knock it, the flip covers are a joke and the milldots are quite large. I now have two Sightrons and won't be going back to a BN.
Anschutz 2013 MEC1 .22LR
Miroku 3800 12bore