I have never seen a MZ that would shoot a 5-shot 1/2" group at 100 yards. But then I have never seen one that would shoot a 3-shot 1/2" group either. You need to back that up a liitle bit. Just stating it does not fit the bill.
Now am I saying that you might have got lucky and shot one 1/2" 3 shot group at 100 yards?? NO. I would not doubt you there at all. But I am willing to bet that you CAN NOT constantly shoot 1/2" gropus at 100 yards---"day in and day out" with a stock factory MZ of any sort. Be it TC or Knight.
I just do not believe it. So I am throwing the BS flag on that one. Tom.