I examine the real-world efficacy of an assault weapons ban. This is achieved through a difference-in-differences model that uses the variation of legislation between states as a natural experiment. The model considers environmental factors that may impact realized effectiveness in a given area. I find assault weapon bans do not cause a substantial decrease in violence or suicide regardless of the particular environment. An assault weapons ban reduces suicide by 1.3 incidents per 100,000 people on average, with the exact magnitude impacted by the income, education level, and age of the population where the ban is implemented.