Nerf sight with exchangeable crosshair

To change the crosshairs of this sight you have to unscrew the visir and insert another plate.
The plates are 3.0 mm high and have a diameter of 32 mm. You can use 1 or 2 plates. These plates come between Nerf Sichtkomponente 1 or Nerf Sichtkomponente 2 and the sight body.