Gehmann #520 Front sight Iris Foresight w/Crossbar Crosshair 18 or 22mm

Gehmann #520 Foresight iris

Infinitely adjustable
Ring thickness of the iris: 1.5mm
Horizontal level bars
Adjustable

520A adjustable from 2.4 - 4.4mm
520B adjustable from 4.0 - 6.0mm
520C adjustable from 2.9 - 4.9mm
Available in both 18mm and 22mm