I know a suicide is when someone intends to kill themselves and succeeds, but what if there was no intention. For example if a stunt motorcyclists decides to jump 15 flaming cars but does not succeed and ends in his demise what is that death classified as? What would you call something less extreme, such as some dying by cleaning their gun and having the gun go off?
Either “accidental” or “death by misadventure.”
Darwin Award.
When someone dies while “cleaning their gun”, it is almost always a suicide that the victim is attempting to disguise as an accident.
That doesn’t surprise me. I also wonder about that in the case of single-vehicle accidents, especially those “at night/high speed/no seat belt” ones we see every so often.
Attempted suicide.
This happened to a college friend of mine (autoerotic asphyxia gone wrong). I didn’t find out that it was accidental until his girlfriend let slip that the coroner’s report had said it was accidental suicide.
According to ER friends, many one vehicle “accidents” as you describe are successful suicides. Bridge abutments are the common stopping mechanism. A dead-on travel path into an abutment (pun intended), coupled with no seat belts and no signs of brakes being used (no skid marks) are pretty good indicators.
How about “death by misadventure”?
That’s good enough for the #2 spot in this thread! 
How does a dead person claim to be “cleaning their gun”?
I wouldn’t know.
I would say “accidental suicide” or “unintentional suicide” or a death by a really, really, REALLY clever murderer 
I believe that English law used to distinguish between suicide (when someone killed himself or herself) and felo-de-se, when someone killed himself or herself intentionally. But I don’t know if there was a specific word for unintentional suicides under this system.
**Whats it called when someone kills themselves accidentally?
**FAIL.
By staging the scene beforehand.
Either that, or the victim’s family/friends found the body and attempted to make it look like not a suicide.
It doesn’t surprise me in the slightest that the claim that deaths by gun cleaning accidents are “almost always a suicide” was made by insurance company lawyers.
It also wouldn’t surprise me if I found out that the ones which the insurance company lawyers don’t suspect to be suicides are those where the dead guys policy does not have a suicide exclusion clause.
An auto accident
Fatal accident.
Actually, profound skepticism about “gun cleaning accidents” is a staple among forensic pathologists who are familiar with such deaths and have no connection to insurance companies. This is because they’ve investigated numerous cases and found indications of staging (see second link below for an example of how one may conclude staging occurred) and victim backgrounds that strongly suggest the likelihood of suicide.
This link from the American Journal of Public Health references a paper published in a forensic journal by a distinguished forensic pathologist (Vincent DiMaio) who is quoted as saying that all of the cases he looked into were eventually concluded to represent suicides.
In cases like these, there is often considerable pressure on the medical examiner to rule the case a suicide, both to protect the “good name” of the deceased and for insurance settlement reasons.
A couple of other factors to consider in “gun cleaning” deaths: anti-gun groups have cited such cases as allegedly showing the dangers of gun ownership, and staged gun cleaning shooting incidents don’t just include suicides (here’s an example of one thought to be a disguised homicide).