This is a work I edited by my father who passed away in 2019. He was a useful guide for all the firearms and general physics/mechanical/electronic issues that came up in the HLH universe. I tried “shopping” this around. I.e., offering it for free. But my contacts in the world of fire control officers is less than zero, as I don’t have a clue where they hang out or their favorite beers. And Covid has shuttered a lot of institutions. This will be of little value to most of my readers as it is incredibly specific data. But in case if you were wondering the level of reality of weapon systems in HLH, it’s actually pretty accurate–understanding it’s a sci-fi comedy.