Cool!
I would have thought full auto with tracers would be the preferred configuration for the rear seat “weapons officer.” But I am not one to argue with the people in the air and getting the job done with a red-dot sight on a semi-auto. Perhaps they are shooting a fragmenting round.
And, as long as the drone or its friends aren’t shooting back, I could see that being kinda fun.
Both Ukraine and Russia have developed multiple projectile rounds that can be fired from a service rifle and their SA clones. US has such in limited production and troops are training with them.