The perpetrator from Krakow used an AR-15. It is the "rifle of America," which has been used multiple times in mass shootings.

A man opened fire in Krakow using a civilian AR-15 rifle, which is often associated with mass shootings. The police reported he had additional weapons and ammunition in his vehicle. The AR-15, originally designed for military use, has become popular among civilians for various purposes, including sport shooting and hunting. Its semi-automatic nature allows for rapid firing, contributing to its notoriety in violent incidents. Experts suggest that the weapon's prevalence in mass shootings may be linked to psychological factors, including imitation by perpetrators. Despite its popularity, many states have imposed restrictions on assault weapons like the AR-15 due to their potential for harm.