Check with Peter Dobson of Hirsch Precision and Rick at Alberta Tactical. If those two can't help you out, my next call would be to P&D in Edmonton.
I had one of these scopes and would be willing to offer some details regarding it that made me choose to sell it and go another route. It's the only time I've had an even slightly bad experience with NF, but it is what it is.
Don't like to trash an otherwise great product line (I own 3 different NF models currently), but that scope is no longer on my radar.
PM if you want details.