My friend turned up at the range on Wednesday with one of these combinations (I think one of these abominations would be a better description).
No way could I get it zeroed. The sights are cruddy soft plastic (as is most everything else on the abomination). It had a sensible enough windage adjustment, loosen the front and rear screw off and the rear screw hole was ellipitcal so you could move the rear of the sight either way, not that it made much difference, the thing shot high and right wherever I adjusted it.
The elevation screw seems to be an allen keyed grub screw and it shaved slivers of plastic off as soon as it was turned.
After jerking about for awhile, I was about to say get a cheap scope, but I noticed that it does not appear to have any provision for scope mounting.
A 22LR/410 combo should be a fun and useful tool,but this one is not shaping up too well so far. I have a good set of taps and dies,I will try and get a few small allen keyed grubscrews as the standard one is buggered.
I hope he didn't pay too much for it.