I'm with Ayoob on this one.
Really easy things to shut off the obvious avenues for an over-zealous DA in case you are involved in a self-defense shooting and it goes to court.
- Keep the stock trigger
- Use factory JHPs
- Don't laser etch 'born to kill' or 'smile before flash' etc. on the barrel
Technically you can of course do this, but do you want to fight that uphill battle with a DA saying - "See, they were so intent on killing people they installed a hair trigger / built custom bullets of doom / engraved their weapon of death with a ready made confession"?