Nase:
There is nothing wrong with a pocket pistol with no sights. These are up-close-and-personal weapons for use within 25 +/- yards. They are point and shoot pistols. At such distances sights are not mandatory. If you have sufficient time and light in a self-defense situation, simply sight along the top of the slide. If not, just point and shoot instinctively.
If you have not altready done so, just practice a few times at short yardage. I predict that you will be surprised how much the pocket pistol without sights simply becomes an extensioin of your strong arm. And, as the saying goes, "Beware of the man who knows his weapon -- he will defend himself at your great detriment."