The whole point was to prove that antigun laws are as useless and counterproductive as the war on drugs.
Gun control works quite well in countries that have decided to implement it nationwide.
Thorough gun control is analogous to bomb control. Anyone can build a bomb with instructions on the internet, but most of us don't. Why? The public has decided that bombs kill way too many people and the law (in the United States, at least), severely punishes people who, successfully or otherwise, blow up a bomb. Like all other hazardous items (with the curious exception of guns), individuals have to be licensed to handle bombs and there is probably a federal registry that lists all of them and where they store their bomb-building supplies.
People in the United States don't have lots of bombs in their houses. Why, then, would gun control enforcement pose any particular challenge?