The flechette round is a wonderful weapon developed after the Yom Kippur War as a way of taking out the Sagger teams that destroyed hundreds of Israeli tanks.
It was developed long before the Yom Kippur in 1966. Good riddance. Fleschette is only good against Chinese human waves. Its absolutely ineffective against buildings, fortifications, infantry in trenches, light armored vehicles... You need to set manualy distance before firing it. During the second Lebanon war fleshettes showed little effectiveness.
APAM can do all that job in best way. Plus it has dispersion mode, when
6 submunitions are exploding one after another and they cover large enough territory. Distance an be set either automaticaly in 120-mm version or semi-automaticaly in 105-mm version.