Translations
Skilled with the bow and ambidextrous—equally deadly slinging stones or shooting arrows—these were kinsmen of Saul from the tribe of Benjamin.
Armed with the bow and able to use both the right hand and the left—whether slinging stones or shooting arrows from the bow—they were kinsmen of Sha'ul from Binyamin.
They were armed with bows, and could use both the right hand and the left in hurling stones and shooting arrows out of a bow, even of Saul's brethren of Benjamin.
they were archers using both the right and left hands to sling stones and shoot arrows; and they were Saul’s kinsmen from Benjamin):

