Honestly, probably doesn't need to be great or even good. Two or three of these could strafe over a trench or other exposed position and just spray. Even if it doesn't cause great physical harm, the sheer terror of it would be useful.
Suppressive fire was my first thought, had the same one about capacity. They have hexaquads now that can lift 30+lbs, at that point they can lift a fully loaded m249 (22lbs according to internet) with room to spare.
Why am I even thinking this, these are terrifying thoughts 😅