Accident vs "Negligence"
From what dictionary are we now defining "accident" as "something you can't prevent?"
An accident is "something you can't predict or didn't intend." If it happened, and you didn't intend it, then it's an accident. If it happened, and you couldn't or didn't predict it, then it's an accident.
To employ the "well if it's negligent then it's not an accident" standard is ignorant and dishonest. It's attempting to assign blame by redefining language.
There are negligent accidents. There are unpreventable accidents. There are accidents that you don't cause. There are accidents you do cause. And THEY ARE ALL ACCIDENTS.
The idea that "something you can't prevent" defines an accident is worse than silly: that means if someone waits for you around a corner and cold-cocks you with a brick, that's an accident. Which it clearly is NOT.
So, enough with this "hey, that's not an accident, that's NEGLIGENCE, soldier!" It could be argued that even an equipment failure is "negligence" because, after all, you could have hired a lab to go through the machine and ensure nothing could fail, so not having a metallurgist and chemist and test lab at your disposal is "negligence."
And that's just silly.
Learn what you can control. Take precautions against the things you can't control. Take responsibility for the things you can control, and then exercise that control properly.
You had an accident. Unless you meant for the gun to discharge, it was an accident. You failed to control something within your domain of competence and that caused an accident.
So recognize the actual failure, do NOT buy into the blame game, re-acquaint yourself with the domain you control, and get better at it.
Competence and responsible control are the only way to beat accidents that are within your control domain.
Thanks for telling us.
Now go re-establish your confidence and your competence, and sin no more.