You understand metaphor, don't you?
How is that verse a metaphor?
And your post utterly misses the point about the sole purpose of the gun being to kill, maim or injure. I can't see that as being Gospel values, can you?
Why do you believe that's the sole purpose of a gun? And, while you're at it, could you please explain why using a gun to protect an innocent person or subdue a violent criminal, even if it results in the death of the attacker or criminals, is inconsistent with "Gospel values", particularly in light of Romans 13?