Steyr part #4005020509
The Steyr LP10/50 sight is adjustable in many directions so you can set the sights to your personal preference. The Width and Height of the opening in the rear sight are adjustable. To open the width of the notch you turn the right-hand screw and to narrow the sight opening you turn the left-hand screw. To make the notch appear deeper or shallower you loosen the 2 screws on the back of the sight blade and raise or lower to your preference.
This sight can also be used to upgrade the sights on your LP2.