Gehmann #520 - Front Sight Iris with Crosshair or Crossbar

3 different models, all available in 18mm and 22mm to fit foresight aperture.
Diffence is notice in the iris opening size.

  • 520A18 & 520A22 - Iris range 2.4mm - 4.4mm
  • 520B18 & 520B22 - Iris range 4.0mm - 6.0mm
  • 520C18 & 520C22 - Iris range 2.9mm - 4.9mm