The main purpose of the Restoring the Armed Career Criminal Act is to strengthen the penalties for individuals who are considered armed career criminals. This legislation aims to ensure that those with a history of serious felony convictions face harsher consequences when they are found guilty of possessing a firearm illegally. Key provisions of the Act include a requirement that individuals who knowingly violate firearm possession laws and have three or more serious felony convictions must face a minimum prison sentence of 15 years, with a maximum of 30 years.