[youtube]tozXF_gyfbA[/youtube]
First off how old is your son? I would sooner go airsoft than bb or pellet for a first gun! They still hurt if you get shot, but wont go thru windows etc. We have 3 of my friends airsoft here. A shotgun,pistol,machinegun. they all shoot the same pellets. the shot gun shoots just one pellet as well. These ones seem to be built fairly tough. I'm sure there are low end and high end airsoft guns just like anything else.