Listening to attorneys on tv this morning, charges for this type of accident are usually dealt with in civil court, not criminal, unless there was some egregious, malicious, chronic violation of standard practices. JMO, it would need to rise to a higher level - for example, obvious, repetitive acts by the defendant to undermine safe practices in a way in which they're aware there is a risk of someone being harmed.
I kind of agree. This sort of tragedy is usually handled as a civil matter, not a criminal one. Seldom do you see corporations, officers, etc. held to a criminal standard in the case of an accidental death. Involuntary manslaughter charges are often applied in cases like drunk driving accidents that result in the death of another. In those cases, the defendant is knowingly engaging in explicitly illegal behavior that puts other people at risk. JMO, that doesn't seem to apply to AB's case. IANAL.
OTOH, pursuing this as a criminal matter could set quite a precedent, lowering the bar for applying criminal charges against anyone using a firearm in a negligent manner, resulting in death. That could be a good thing in making gun owners, manufacturers and sellers more accountable.