Go back to my post on "can you explain..."
High visibility sights/night sights are an easy explanation. It makes you more accurate, less risk of misses, safer for the community blah blah blah. Textured grip, easy to explain. Sweaty when nervous, makes it harder to drop, increases safety for the community (especially if it's a P320...
), etc. A light, etc.
"Their" lawyer wants to paint you as a reckless jackass with a hard on to kill somebody. "Your" lawyer wants to paint you as someone who reluctantly had to take a life and who is a pillar of the community, concerned with the well-being of all.
I was asked where on the body I aimed at when I shot "X". Does that really make the difference in a good shoot/bad shoot?
Of course not. But no matter what the answer, the next question is going to be "why?" I was able to truthfully answer "because that's how I was trained" and that ended it. I would never ask this as an investigator, because it's irrelevant to me. It's incredibly relevant to a lawyer looking for hooks.
Moving into the realm of hypothetical, say you took a head shot.
"Where did you aim on my client's body?"
"The head"
"Why?"
What he wants is a hook. "I wanted to kill him" is a hook. If he can get you angry or worked up and get you to answer without thinking and you say something stupid, he wins. If you say something reasonable, he just moves on. (Side note, in depositions ALWAYS take a breath before answering a question. Only answer the question. Do not elaborate on your answer once the question is answered. If they are silent, sit there and STFU, they are waiting for you to start rambling to fill the silence.)
That's the point. Any modification can be used to fish for a hook. Some are much easier than others to actually be a hook.