Quote Originally Posted by browningautorifleicon View Post
Sounds like you just did the math yourself...
Yes. Although I cheated by looking up the sight height and radius rather than going back down to the shop to measure myself.

Quote Originally Posted by browningautorifle View Post
when it comes to TDC
AR's are even worse with their high sight post. I think the tolerance spec for zeroing is something like 7 or 8 clicks from mechanical center. It's in a TM somewhere. I bought a brand new barrel from a shop on which they pinned a front site post for me. I went to zero and I needed 15 clicks. Tried to tell me at first it was normal so I did my own homework looking up the spec. I won't name the shop because he did make it right and exchange for one done more carefully.