Quoted: Depending on the way the red dot will mount, yes, the FSB will probably get in the way. A riser/rail segment will probably solve that problem. I removed my FSB on a 16" Carbine length HBAR, ground it down into a gas block, then free floated a full rifle length YHM rail system to solve the problem
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Whoa, hold up there partner. Raising up the optic so the front sight is no longer visible through it is
not the best way to do it.
In order to get the front sight out of the optic's window, you would have to raise the red dhot up significantly. This is basically the same as mounting the optic on the carry handle which is not the preferred way to do it, for the most part. When you raise the optic too far about the bore, it becomes more difficult to get a zero that works well (no excessive holdover) within 200 yards. If you don't care about having a front sight, then that's cool. That's your choice albeit a less common one.
To answer the OP's question, if you are focusing on the target, the front sight will magically "ghost" away because you are not focusing on it. The safest and smartest bet is to get your red-dot, mount it up and use it with the fixed front sight for a little while and decide for yourself whether or not you like it.