Justice Department Concludes Federal Ban on Handgun Sales to 18 to 20-Year-Olds is Unconstitutional and Cannot Be Criminally Enforced ↧ Justice Department Concludes Federal Ban on Handgun Sales to 18 to ... Today, the Department of Justice’s Office of Legal Counsel released a legal opinion concluding that the federal prohibition may not be enforced against licensed dealers selling handguns to otherwise law-abiding adults ages 18 to 20 consistent with the Second Amendment.