Board Thread:Naruto Discussions/@comment-31058120-20170228032007/@comment-24142271-20170228050538

Guns do exist in the Narutoverse. We've seen them a few times. I can think of two instances off the top of my head; one was seen in the first few chapters (Ch.19) and i recall the prison guards in the Blood Prison movie had guns.

Do we know how they work in universe? No, but if i had to take a guess, they aren't the same. Just cheap imitations of what we have now. I recall Kishimoto complaining about how the movies used firearms and vehicles yet he draws a gun, heh.

Assuming you can hit your enemy in the head, it's a kill. Most characters won't survive being shot in the head.