Talking of deluded... my Webley Senior was not designed to, nor has ever been used to, inflict bodily harm or physical damage (except to paper). Ergo it is not a weapon. The same can be said for all of my airguns.
Then again, if a Webley Senior was used to bludgeon someone to death, it could fairly be called the murder weapon.
Vintage Airguns Gallery
..Above link posted with permission from Gareth W-B
In British slang an anorak is a person who has a very strong interest in niche subjects.
I agree with Danny. If an object is designed to inflict harm then by definition it is always a weapon. Anything else is not a weapon until the time it is used perversely to inflict harm.
So all my airguns at the moment are no more weapons than the bread knife in my kitchen drawer. But of course things could change if I am pushed too hard!