Here's the bottom line as I see it.
A hostile lawyer is paid to take you down. He will use everything he can to do that. It's his job. Did you use hollow points or reloads? Is there a scary picture of a skull or dragon carved into the grips of your pistol? Did you shoot the guy 2 in the chest and one in the head? Did you have a specially made, highly customized .45 acp that you carry everywhere, in case you "have an opportunity to use it?" Shoot, even your tattoo that says "kill them all and let god sort them out" will be used against you.
A lawyer is going to be smarter than the average yahoo, and he will know his job. He may be an angry crusader, who hates people who have guns, and you may present a challenge to his principles. winning against such a person is going to break you in legal fees.
Let me be honest. I'm a coward. I don't want to spend thousands of dollars and hundreds of hours in court trying to save my butt because I used glasers instead of silvertips or hydrashoks. You will make a target out of yourself by going to extremes. Is a light trigger, a titanium firing pin, or whatever, an extreme? That isn't your decision. it will be the decision of a hostile attorney.
The very best advice I have to give to anyone is that they should buy a factory made combat ready pistol. They should use standard police rounds like hydrashock or silvertip, for example. You cannot seriously be accused of deliberate murder by using a super duper criminal killing gun and ammunition if all you did was take an off the shelf "specialty" 1911 and standard wal-mart ammunition.
And most importantly, you shut up, and not even discuss what sort of weapon you used.