USGI M16A2's do not have m4 cuts in the upper but do have them in the barrel ext. (I have a USGI FN A2 complete upper and thats how its configured) so that part of your Model1 upper is correct. Sounds like the only thing off is that they used an F marked front sight base.
I would just change the sight and be happy....or just leave it and change the sight post. I know lots of guys that run Model 1 uppers and are very happy


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