OK time for some fact-based info
@Chris Miller: I seriously doubt it was an aisle, unless you're talking about airsoft or other non-lethal/toy guns. Some of the larger Walmarts in the US do indeed have a sporting section which includes a separate desk with locked display cabinets of firearms behind. Mostly hunting rifles. Its not like you can just wander down an aisle and take an AR-15 off a peg. And while I'm at it, lets end another myth: Whenever you buy a firearm in the US you have to pass an FBI background check before you can take it away (Gun shows and private trades are the only exception). Its just a form and a phone call but nevertheless it's actually not as easy/unregulated as the fact-free sensationalist UK media (including the BBC) would have you believe.