Re: Loyal Friend
I just don't think it works. There needs to be some kind of actual zombie reference here or people are going to just think it's referring to homicide, or assassins, or drug dealers. "Sure I'm willing to kill all my friends for some vague unspecified reason that you can make up yourself!"
I get that you were inspired by Zombieland or whatever, but that line isn't from that movie, and Zombieland certainly isn't what most people think of with the term 'double tap'. It's military lingo for 2 quick shots to the target on as close to the same spot as possible. Furthermore you don't double tap with a shotgun anyway, so your shotgun shells don't make much sense with the slogan.