Both sights needed.
I THINK I CAN USE ONLY THE LEAF SIGHT WITH YOU.
WRONG! YOU NEED MY QUADRANT SIGHT, TOO,
What sights are needed For the M203 grenade launcher? I have heard the leaf sight is all you really need.
Dear Specialist D. P.,
All of the M203 grenade launchers (M203, M203A1, and M203A2) should be equipped with both the leaf and quadrant sights. The leaf sight is generally what's used most during firing because it's the easiest to use. But it's only effective up to 250 meters. The quadrant sight, however, lets you fire out to 350 meters.
Both leaf sight and quadrant sight should be mounted on M203