I had the same thoughts when I first started renting the duplex I'm at now. I couldn't find anything in the book that says I couldn't have firearms. The only thing that came up is how much powder I can store for reloading because apparently there is a law that applies to duplexes for that. My landlord is pretty good once he saw my reloading bench I assured him I was licensed and had safes for every thing. The only thing he said was he knows where he's going when SHTF.