VTAC Rail Issue, or iron sights? Updated w/ SOLUTION

[Gunzilla]

Got a response from BCM regarding my problem with zeroing my new BFH upper with the 13" VTAC hand guard (still hitting way too high).

They said: "Many times we recommend not using this type of setup because of the sight issues." Can someone explain this? I guess I'm thinking that someone had to find this problem before now, so why are they still having a problem?

This brings up a ton of other questions but all I want to know is who has 13" VTAC hand guard on their BCM (that came that way from BCM) that is using folding iron sights that are zeroed......and can you post a pic of your front sight from the front and rear? Thank you in advance.

My set up is: 16" BCM w/ 13" VTAC and Troy folding sights, zero is impossible to achieve, shots are hitting 4 inches high.....and I can see daylight under the front sight detent collar.