Boys and guns

We just returned from a garage sale where we got a big box of trucks! Yipee! What we didn't get, much to Kenneth's dismay, was a toy gun that made a shooting sound. So far the only "guns" that we have in our house are squirt guns, and then the various other objects that Kenneth pretends are guns. So far our rule is that you can only shoot animals (not people) - and that you are either shooting them for dinner, or to protect yourself. So, know I'm wondering whether or not we want to have actual "guns" that make shooting sounds in our house? I'll have to talk to Andy about this tonight.....Anyone have any thoughts??