Depending on what type of optic you're using, you probably won't have problems with the front sight post.
If you're using a 1X optic (Aimpoint, EOTech, etc), seeing the front sight post is a matter of preference and there are different mounts to deal with this. A true co-witness (the line of sight of the optic passing through the line of sight of the irons) is still functional, and many shooter prefer this. A "lower 1/3 co-witness" mount will raise the optic some, so that the dot floats above the line of sight of the irons.
If you're using a magnified optic, you probably won't be able to see the front sight at all, except for at low magnification. And even then, it appears as a blur that is easily ignored.
If this is for a range rifle, plinker, etc. that you don't need back up iron sights for, there is no problem with grinding down the FSB. Lots of folks do this too.