[ANON POST] Penalty for stealing a police officer's gun

[kutsuwamushi]

What's the penalty for stealing a police officer's gun in modern day first world countries where civilians are allowed to own guns? What sort of trouble would the police officer would be in if the only reason the thief could steal the gun was the officer's carelessness?

I've Googled stuff like "penalty for stealing police officer's gun" and gotten nothing. The country this is set in doesn't exist in real life, so I'm just interested in the range of possibilities in the real world.