Indonesia is one of the countries that is very strict in regulating firearms, namely in Emergency Law Number 12 of 1951, where one of the provisions is that firearms are prohibited from being possessed without rights with a serious criminal threat. However, in reality, there are still cases of illegal firearm ownership by civilians that can threaten the safety of the wider community. This study aims to find out how law enforcement is carried out against people who own firearms without official permits, and to find out the obstacles in law enforcement against perpetrators of illegal firearms ownership. This research method is normative juridical, with a legislative approach and a case approach. The results of the research show that the provisions in Emergency Law Number 12 of 1951 state that every person who violates the provisions of the law is punished with a severe penalty, namely the death penalty, life imprisonment or twenty years, but in its implementation, the punishment imposed by the judge on the perpetrator is still very light. Second, related to legal obstacles in law enforcement, namely the lack of firmness of law enforcement, especially judges in imposing criminal penalties on perpetrators of the crime of possession of firearms, and the lack of public awareness of the law.