Not sure if you can, but what I did was drill a small dimple in the front sight and then put a drop of irredesent sight paint in it. This worked out great. So good as a matter of fact I did my other two guns like it. I wish I had a photo of the sight to let you see how good it works, but don't - sorry.

My eyes ain't as good as they once were and this lets me pick up a good sight picture. If you find a good fiber optic sight, make sure you remember that the gun is made in Italy and that means metric dimensions on the dove tail.