Remote Chances: A Trio Of Classic Sci-Fi Short Stories

The Right to Bear Arms -- A physics professor is so distraught at his son's death by a mentally deranged man carrying an automatic weapon, that he devises an incredible plan that he hopes will change history forever. Raymond The Automatic House - After an apocalypse, a former soldier stumbles across a strange house in the woods. Terran Spies On An Alien Planet - A government official on a planet currently at war with earth, finds two supposed spies at a bar and suspects they are Terran agents.
They are pretty 'dense' and after grilling them for a period of time, he follows up on a couple of tips they give him and their supposedly real reason for being on the planet. However, things change suddenly for the official and his planet as the situation heats up.