I know this topic has been posted before for Stag uppers, but I've got a S&W M&P15 (made by Stag) with the same problem, and I was curious if there are any M&P15 owners here who have contacted S&W about this and what their response was. I'll probably call them on Monday, but would like as much info from other owners as possible beforehand.
Again, this problem involves having to set the front sight post so high that the top of the post sticks up above the level of the protective "ears" of the FSB when attempting to zero the elevation of the M4 carbine. This problem seems to be isolated to owners of Stags and S&W's. A friend of mine who owns a Bushmaster M4 type does not have this problem. Several people have mentioned having this problem when using the ARMS#40 backup rear sight(including me), but I reinstalled the original carry handle rear sight and am having the same problem with that, so it doesn't appear to be a sight problem.
Some people, including me, also have a problem with having to move the rear sight aperture way to the right in order to zero the windage on these rifles.
There is also a discussion about this problem in another forum:
http://www.ar15.com/forums/topic.html?b=3&f=18&t=311257


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