Inclusion Criteria:  Flint or Saginaw Youth between the ages of 16 to 24 reporting past 3-month firearm carriage and ownership of a smartphone, including those seeking care for any reason at Hurley Medical Center or Covenant Medical Center Emergency Department. Can provide consent (age: 18-24) or youth assent and parental consent (age: 16-17) for the study.  Exclusion Criteria:  Incarcerated (i.e., in active policy custody and not able to provide informed consent) Presenting to the ED for active suicide ideation or attempt, sexual assault, and/or child abuse Unable to provide informed consent due to mental status (e.g., alcohol intoxication, acute psychosis) or medical instability. Participants will be excluded if firearm carriage is exclusively for legal work (e.g., police), hunting, or target shooting.