[A/C Guy]

For a dyed in the wool anti gunner, only a traumatic event that touches their personal life would do it. Their child's life being saved by a CCW holder, or something equally earth shaking.

I doubt that even that would change their mind. To change their mind would be an admission that they were wrong. Most people will refuse to admit that on such an emotional issue. Also, it takes humility and maturity to admit that you are wrong on such an emotional issue; very few people are that mature, and even fewer are that humble.