My children have never been allowed to have guns... everyone would buy my older children water guns though and that sucked. They would use their water guns at their Nan & Grandpa's house but at home it was the water spray bottles they used on hot days.
My 15yr old DS bought himself a cap gun a few months ago to try out, just because he never had one growing up and was curious about it. It was awful, it looked so much like a real gun and we made him throw it out... he wasn't bothered by it, he thought it was boring and was worried someone out there might think it was a real gun.