We and every other forum has discussed this intensively. I'll spare the long repetitive post. Not a lawyer but a cognitive psychologist who has studied decision making a touch and researched it a bit.
So bullet points so to speak:
1. If you are on trial, it's not a good shoot and not obvious it was self-defense to some
2. You will object to a gun issue. Not a lawyer but a panel of lawyers had a discussion that I read and they said in their jurisdictions it was 50/50 if the objection was upheld.
3. Jury research on objections (ref to follow):
a. Juries are not necessarily intelligent and rational decision makers.
b. They make take from your objection that the issue was really bad because you are waving your arms about.
c. In deliberation they make not remember a complex argument from your expert. They just remember the topic that the issue is a bad thing. Better vett your expert. Get a test jury (that costs).
d. Can't trust gun folk to support you. Studies show that they might think the gun issue indicates you are a doofus for it as it clashes with their 'expert' view.
e. The prosecution may not have to make a big deal about it (I OBJECT), they can simply describe the gun as a fact without histronics. Such increased exposure has influenced juries without histronics.
4. Your intuitions or your lawyers' intuitions tell him or her that such an issue makes no difference. Expert intuition can suck in many situations (read Kahneman's book - Thinking Fast and Slow, summary https://en.wikipedia.org/wiki/Thinking,_Fast_and_Slow
The classic case was OJ from what I read. Marcia Clark had an intuition about African-American women on the jury that was contrary to her jury experts. Guess who was correct?
A good read on jury decisions in general (not just gun world) to show important factors is:
Devine: Jury Decison Making: The state of the science.
If I had to have a lawyer defend me, I would want one who had reasonable expertise in firearms issues and how decision making occurs. Did they read, take a CLE, or other seminar on such? Will they test their strategy?
Whether the OP issue's might influence someone - well, get me the Galactic Corps Lens from Arisia and I'll tell you.
BTW, if you get 3 or 4 people who buy your position from the get go (opening statement) with the rest unsure, they seem to carry the day, according to some studies.