Chuckas are always elemental, and "fire" a continuous stream of their respective element which does damage per tick equal to that stated on the card. They have very limited range, so they're only useful in close range engagements.
Notes[]
The Chucka is obtained randomly from any suitable loot source.
Chuckas do not benefit from fire rate increases, as it does not increase the ticks per second or damage per tick. It only increases ammo consumption.