Background: Firearm ownership is extremely common in parts of the USA. Yet little research has examined whether it is associated with impulsive symptoms and traits. Methods: Adults aged 18-29 years who gamble at least occasionally were recruited in two US cities using media advertisements for an exploratory study examining general mental health, impulse control disorders, impulsive personality, and aspects of cognition (decision-making, response inhibition, and flexible responding). The participants were grouped as firearm owners and non-firearm owners; these two groups were compared on the above measures. Results: 149 young adults took part, of whom 33 (22.1%) endorsed owning one or more firearms. Firearm ownership was significantly associated with male gender and elevated risk of gambling disorder, but not with other measures of impulsivity. Discussion: The link between firearm ownership and disordered gambling merits further research and may have policy implications, such as in terms of screening for guns in gambling arenas including casinos. Further research is needed to explore potential associations between gun ownership and impulsivity in cohorts with other demographic characteristics, including longitudinally.