Joe Biden is a bit of a buffoon, but that thing about firing a shotgun through a front door is taken out of context. He was referring to someone's question about hypothetical end of days where target ID rules likely aren't such a big deal.
Biden did actually advocated firing a warning shot through a window, which is illegal and presumably not during the end of days. Not very clever, Uncle Joe.
It's kind of like the Al Gore Internet stuff. I am not Al's biggest fan, but the guy never said anything about inventing the Internet. Al Gore was instrumental in getting the Federal Government to begin using the networks, particularly for check processing. He saved the taxpayers quite a bit of money by doing this. Gore was one of the first elected officials to really get what the Internet was going to do for society.