Well, how good do you shoot with open sights? Can you hit a beer can at 100 yards, fairly regularly, offhand? Almost every time, from a rest?
How well can you see, during those legal shooting hours called "first light" or "almost dark"? Well enough to tell a fella from an elk? Are you sure?
In good light, and "up close and personal" for a rifle, iron sights are fine. Only you know your skill level. I don't.
Best luck, Art