ptco911 said:
If the owner is set on the diopter sight, why as the question?
The SIG diopter is adequate for what it is. It is not, in my view, unreliable (which is what the original poster thinks it may be).
While it is true that it is not the best option either, there were some issues with Aurora's QC as well. Recent purchasers may chime in to comment on that. Also, the fact that the website shows a drawing of the rear sight instead of a picture does not give me a warm and fuzzy.
While I prefer the AR15 type sights, due to familiarity if nothing else, I have nothing against the SIG diopter sight and in fact purchased a 556 with a diopter on.
My only gripe was that the rifle shot way to low at 100 even with the drum set to 300, and unfortunately I ran out of elevation to correct the issue. While I have no qualms adjusting front posts, I'm a little uneasy to fix the SIG hooded front sight, since the post is not replaceable and is beveled: by taking metal off the top, you end up with a wider top. The hood also makes working on it more complicated. So, once I've calculated how much metal to remove, I will take this one to my smith for action.
The hood and diopter currently sit on my daughter's 522, though I wonder whether it may not make more sense to put the Samson FS and LMT rear on that.