Get your own story straight. That link says nothing about Joe Biden sending anybody, anywhere. Or, anyone else for that matter. Moreover, the Vice President of the United States has no authority over the ATF, unless it's delegated to him by the Chief Executive and I've seen nothing to indicate that's been done...have you?
Secondly, if it's a conspiracy, it's one which started under the Bush administration because our local Walmart here abruptly stopped selling guns several years ago, with no explanation. Yet, the store in a neighboring town, less than 10 miles away, still has racks of them.
Your Walmart isn't the only one which no longer sells guns and it's got nothing to do with Barack Obama, Joe Biden or the current "gun grab" hysteria.