I'm sure this has been discussed into the ground before, but I really need to understand this. I would like to install a float tube on my standard barrel length Bushmaster. All of the armorer's manuals I have looked at say do not remove the front sight base. How do you install the float tube without removing the front sight base? I do know (by messing around with them) that the front sight base pins in my gun feel like they're welded into place, so I'm not sure I could get them out if I wanted to. Will the float tube come off over the milled front sight bases? I'm sure this is elementary to most of you, but this really seems like a clusterxxxx to me. Any information would be appreciated.