Going a bit further, one of the reasons for a railed front sight vs a fixed front sight tower is to prevent seeing the latter with low magnification and especially no magnification optics. The lower the power the more you see the front sight tower. As power increases it eventually disappears, though it might make a dark fuzzy "shadow" in the scope image.

So there is an advantage to either having no front sight, or a folding or removable front sight, when running optics. You've probably seen the term BUIS, but if not, it means Back Up Iron Sight. This generally means a set of folding sights that can quickly come into play should your optic break or fail. But it can also be a set of sights you can install in the field in place of your optic, though this is much slower.

The front rail also offers more flexibility in choosing sights vs the basic front tower design. Numerous styles of folding and fixed sights that attach to rails are available. Just be aware there are two heights of rails. Low profile, and high profile. The latter has the rail at the same level as the rail on the receiver, like the Sport II OR. Make sure the front sight matches your height of rail.