About the same level of accuracy as you get from a low end semi-auto .22, or maybe a bit better. To a large extent it's determined by how good and how fine your sights are. If you have a thick blade and a coarse rear sight, you should not expect to shoot to the same degree of accuracy as if you were using a much finer set of sights.
The advantage to coarse sights is that you acquire a sight picture much quicker, which can be an advantage in a hunting situation. And that's really what these guns are made to market to. If you really want to see what the gun is capable of, replace them with fine sights, (which will be a disadvantage in the woods).