I believe you are going to have to talk to Bersa. The screw is definitely missing. The sight blade is probably quite loose with the screw missing. May fall out.
Do you have a Gander Mtn nearby? They may be able to do the warranty work on it.
edit: The screw is used to adjust the sight blade for windage (left or right). It probably also retains the sight blade in the base.
Do you have a Gander Mtn nearby? They may be able to do the warranty work on it.
edit: The screw is used to adjust the sight blade for windage (left or right). It probably also retains the sight blade in the base.