It would probably be wise to get a trauma kit and some basic understanding on how to use it.
Unironically, a great idea. And to have at least 2. I don't want Nool to be overwhelmed, but in this day and age, if you break, you fix it. By that I mean, if you have to shoot someone, you will have to provide immediate medical aid (even if they tried to kill you 30 seconds ago) as soon as it is safe, and it is not a danger to yourself.
One of the most common ways a prosecutor will try to score points in citizen involved shootings is by asking "Why didn't you provide first aid?" as a way to prove homicidal intent and lack of regard for human life.
Also remember, only DOCTORS can actually legally call someone dead (barring some sort of decapitation and gross dismemberment). So if you shoot someone, you may say "I didn't provide aid because they were already dead." and you might be 100% right, but they will answer back with "Are you an MD?" "No" "So how could you actually tell if they were really dead? You left them to die, didn't you."
My point, carry tourniquets, gauss and gloves. Learn to pack bullet wounds and cover them with bandages. Even if you shoot someone deady dead, you still need to provide aid to avoid homicidal intent accusations in court. (Which, to be fair, you shouldn't have to begin with).
Also
You get so much millage out of these bitches it's ridiculous. They allow you to train hard, simulate dry firing, target acquisition, handing, etc. without the fear of banging up your gun or shooting your wall on accident and without the apprehension new shooters have when they handle a firearm.