Emergency only. Wouldn't wanna get hit by anything this throws.

[Mass-manufactured didn't make them any less dangerous.]

Depends on the gun. These have their own slugs- usually metal rounds. Others fire off energy, like a beam or a short blast.

[He sets the gun down, looking around for something. Eventually he turns and steps towards the nearby wall where a couple of guns decidedly different from the rest stocked on the racks sit, alongside a massive sword of some kind. He opens a box on the floor nearby, comes back with a bullet almost half as long as a finger.]

Like these.