If you set them to single-fire (giant asterisk) or three-round burst, it’d be a fantastic way to perforate an area instead of a line. Maybe mix-and-match so each pull gets you a dense wavefront, then a thinner hail of bullets, and then a couple streams that stop working shortly after contact with the enemy.
At the very least, have a separately-triggered one in the middle, set to single-fire and filled with tracers. Walk it in to be about right… and “about right” will get the job done.