Well, let me tell you two things, the sensible answer and the legal answer.
The sensible answer: Before I went to law school I was a police officer who has seen a lot of people get into trouble, therefore I speak of experience: DON'T EVEN THINK ABOUT THIS!
For some years I was wearing body armor and gun and all and do you think I would have wanted voluntarily to get into dangerous situations? I would have been stupid. Body armor can protect you, but only to a certain limit. What will you do if one of your opponents will draw a gun? If two of them draw a gun? If one swings a bat at you knocking you out while the other will stab you in the throat and the third shoot you in the head? You never know what kind of arms a gang of scum is carrying around. Don't be stupid and go out and look for trouble. If you happen to see a crime being committed, call 911 and observe and offer to be a witness, that is much more helpful.
Second, the legal answer: You might walk into deep deep trouble. First of all, in most states it is a crime to carry these kind of equipment or weapons unless you are a law enforcement officer. Body Armor for example is restricted in many states, so are knives etc.
And even if the possession or the carrying around of those weapons might not be criminal, the USE of them probably will be. If you use deadly force in any way against another person without being justified, you could face a murder charge, attempted murder charge, aggravated assault charge and the like, or in other words, look at felony charges that would lock you up for years.
Any instrument that is used that is potentially deadly is under the law a deadly weapon.
Deadly force under the law can only be used in very very limited situations, usually only to defend yourself or another person against an unlawful imminent attack with deadly force.
So, let's say you walk around with your terminator 9mm in your pocket and come across Joe Scumbag who happens to be just raping Fairy Lilly and just getting ready to stab her to death. You pull your 9mm and shoot him right between the eyes. You will be lauded as a hero.
But most cases are not that easy and clear cut.
You come across the ScumbagsRus Gang at the next street corner who appear to be jumping Billy Innocent and his brother Joey Harmless. You again pull your 9mm and challenge the Scumbag Kids.
Now, what you did not know is, that actually Billy Innocent wasn't that innocent at all but had started the quarrel by hitting Carlos Scumbag, the gang leader, right on the nose with his little blackjack, while Joey was pointing a kife, which you didn't see, at Carlos little brother Carlito. The Scumbag Kids actually were defending themselves. Now you barge in threatening the Scumbag Kids: you are the aggressor, you are committing assault. Worse: Carlos thinks you are a buddy of Joey and tries to stab you, defending himself, and you shoot him dead. You will be charged with murder.
Other example: You come across the same corner and again see the Scumbag Kids jump two really innocent kids. You challenge Carlos and his gang, the kids run away. Words are being exchanged. You feel invincible in your body armor and stuff and challenge Carlos, making fun of his Mexican accent. He punches you in the nose. You shoot him. You will face murder charges. Why? First of all, the court would probably say you were the aggressor. After those kids ran away you could and should have retreated, too. Second: You answered non-deadly force with deadly force. That is a big no-no.
You see: unless you can afford to bring your attorney along on each of your terminator trips you will be bound to get into a legal trap and into big big trouble.
So, don't even think about it!
