First, in what state do you live?
What is the political climate in the court system in your area?
Do you have a CCW?
Do you have any history of assault?
Realize that every situation is unique, but........You should not use a gun unless there is an imminent threat to your life or the lives of others. I assume the same would hold true regarding martial arts training.
It is my contention that a MA background can be played to a jury to look as though a trained martial artist had other options than to use a gun. For this reason, I believe if a martial artist uses a gun, he will be at a disadvantage in a jury trial. That being said, if you follow the law and have to use your gun in justifiable self defense, you should not ever see a jury unless your DA is prosecuting cases for political gain.
As a martial artist though, you no fewer rights than Joe Citizen.
Criminals will not check with you first to see if you are a martial artist and then agree to fight you in the syle you wish. You will likely be attacked by three at once with a couple more waiting in the wings for when #1 and #2 land on their butts. Unless you are capable of defending and surviving a simultaneous attack by 3-5 criminals who will not follow your rules, who will use any weapon at hand, and who will stomp you after you are unconcious, perhaps you should consider engaging street threats with a gun. That is the reality of an attack outside the dojo.
Should I have used my training to disarm the attacker or open fire because my life was in danger???
Why is this statement past tense?