And without being able to look through it, I'll guess your front sight is the rather standard Globe sight, where inside of the tube you have a ball that sits on top of a post. That's also a good sight except that the ball has the habit of covering and hiding bullseyes unless those targets are pretty big. Because there is no rear sight on the barrel and no dovetail to accept one, you can be fairly sure that your rifle was shipped out with the sights that are on it.
