I asked you this in another thread, but why don't you just pop the pins and straighten the FSP? Or hell if the specifics on the barrel mean that much, just drop a YMH gas block/flip up sight on it?
Sorry, I didn't see your question.
As far as I can tell either the front sight base is out of spec (which is discussed quite a bit on AR15.com,
http://ar15.com/forums/topic.html?b=3&f=18&t=311257&page=1), or the front sight post is. Nothing is crooked or bent, that I can see.
To get my Eotech to co-witness I had to nearly bottom out the front sight post. (I haven't shot it to check the zero since the EO was installed.)
I get your point on the YHM flip up, but my point is I shouldn't have to drop an additional hundred bucks (money isn't really an issue, I'd just like my AR to be a performer, not a dud.) or so to get my M4gery to shoot like it should from the factory with the irons.
I've considered the LMT Adjustable Rear Sight (
http://www.lewismachine.net/product.php?p=65&cid=2&session=3f1670eea99648f6a44eaa3d849aeec0) At least then I could adjust my elevation when needed without having to adjust the FSP. The only downside of going that route is I wouldn't be able to lower it out of the way like I can with the ARMS 40 that is currently mounted.
So far I've got 3 emails out to Stag and as of yet haven't gotten a response from them, I guess it will take a phone call.
(Stag had responded to my earlier email, but it was caught in my spam blocker.)
If anyone has opinions, or ideas on how to resolve this please feel free to chime in.
Thanks in advance.