3D printing a fake gun will get you killed

Ridiculous projecting.

I don't understand what point you're trying to make with the title and summary, but this is a great idea for use in drills and if you just want a cool gun shaped silhouette on the wall.

You are fake news: printing dummy guns (reccomend colors such as blue to avoid confusion) for training such as disarm and team-drills is an excellent idea.