While much existing research has examined either juvenile or adult weapon carrying, this study assesses whether carrying a weapon to school as a juvenile is predictive of bringing a handgun to school or work in adulthood. Data are drawn from the National Longitudinal Study of Adolescent Health. Results show a decline in weapon carrying behavior over time. However, youth who report school weapon carrying in adolescence are much more likely to report carrying a handgun to school or work in adulthood. Findings also demonstrate that victimization, rather than offending behavior, is predictive of adulthood handgun carrying at school and work.