YES i would let my kids play with guns, be it cap cuns or air rifles or when they get older shotguns. cotrary to popular belief, guns are NOT DANGEROUS
Get down to Moss Side you! 
I live just down the road from moss side mate and have lost many a good friend due to gun crime. but still stand by my beliefs that guns are NOT DANGEROUS.
it's the people that have ready access to them that are dangerous.
1 simple easy test.
get 1 gun, load it and make ready. sit it on a table in a busy place (trafford centre ) leave it there for 12 mths and see how many people it injures/ kills. i would put money on it just sitting there gathering dust and not hurting a single person.
what we need to understand is thatv it is MAN that is the danger not some inanimate object, be it a gun/knife/ screwdriver etc etc.
i'm not making light of gun crime and sincerely appologise if i have upset anybody with my comments.
i have been brought up around weapons air rifles/ shot guns/ cross bows. compound bows. i can hold my hand on my heart and honestly say that i have NEVER killed another living thing with any of these weapons. at the end of the day it's all down to the person who is holding the weapon. NOT THE WEAPON ITSELF. rant over