A male shop attendant (aged 21) working at a Family Mart in Kanazawa was threatened with what seemed to be a gun.
The shop attendant said to his assailant:-
That's an air gun isn't it?"
And with that the assailant ran off without taking anything ^^;
Via Itai News
And as for these pics - took them at a matsuri that was held in Yokosuka this weekend. Apart from winning them in raffles, air guns are pretty much readily available - even I have a Beretta which you can see in the Dakimakura photo article.
I saw in some comments that some of you have not only air guns but real guns at home?