Engineer2001,
Thanks for the input and correction. I must have had charging handle on the brain!!
Ultimately here, I'm trying to get confirmation that the short Front sight Base is my problem. Then I have a legitimate arguement for model1.
My model1 upper is a 20" as well, no "F mark" on the front sight base and, as I said before, a taller detachable CARRYING Handle. I say taller DCH because in my search, I came up with the below post that explained a lot. The search you came up with just let it all flapping in the wind with no real answers.
http://www.ar15.com/forums/topic.html?b=3&f=118&t=262213
I contacted Model1 and they have to wait to speak to their "technicians" on Monday. I have fired M16A1's and A2's for the better part of my adult life and never had a front sight post adjust out of the sight housing like this. I just don't understand it.
Metzgeri