Zeroed irons- problem on FF rail?

[MookNW]

I've been sockin away for a while to get a 12" Larue lt15-12 for an upcoming build. I had just assumed that the DD iron sights I was considering would be fine. Are there any concerns regarding the front site holding it's zero on a FF rail, assuming it's installed correctly? I would prefer this setup to a barrel with an FSb. and a rail with a hole in it.

[William B.]

If it's installed correctly you shouldn't have any problems.

[Joeywhat]

I have both my front sight and Aimpoint mounted on my free float tube and both hold zero. Zero issues whatsoever.