Zombie stuff is fun, BUT, if you have a home or personal defense weapon, DO NOT use zombie ammo, do not modify your safety, do not trick it out with multiple accessories, do not make it look like something a superhero or sci-fi character would use to hunt aliens. It doesn't matter to a judge and jury if any of that stuff works, it LOOKS BAD, it LOOKS like you want to kill people, it LOOKS like you're a gun nut, and looks will get you time.
Take that stuff to the range, take it to gun shows, show it to your friends, but keep your trusty stock 12 gauge (or what have you) by the bed.