passing on this deal ...... i guess, if your norc sights feel good... stick with them.
It has been my experience though, with all the norcs i have handled.... the rear sights just aren't up to par. It's not so much that the metal is soft, it is that the tolerances on the machining of one of the critical parts is off enough to cause this part to strip the threads on the pinion shaft on the windage adjustment side. If you never take the sights off, yer probably o.k. but i have found that there is generally so much "machining grit" left in these parts that it acts like a lapping coumpound and wears out the elevetion sight pinion gears. This means that upon cursory inspection of a new rifle.... the sight often needs to be removed, cleaned, lubed and re assembled. It is during this process that the windage lock ring that mates with the pinion shaft, spins when it's not supposed to and flattens out the pinion shaft threads on the windage side. And THAT is the main reason guys like me recommend swapping out for a garand sight as this problem virtually does not exist with usgi m14 or garand rear sight.
your mileage may vary...... and your findings may vary..... depending on how many of these rifles go through your hands and work bench on a weekly basis

. 167 rifles later and .... i found this part out of spec on 90 % of the rifles i have inspected. I do however have several good norc sights ..... but i did operations on the windage bolt, replacing the windage lock rings with new ones that were to spec