A group of Republicans and Democrats in the Senate on Tuesday released a compromise bill aimed at keeping firearms out of the hands of dangerous people, taking a substantial step to break a years long impasse in Congress over how to address gun violence.

While the legislation falls short of the sweeping gun control measures Democrats have demanded, if passed it would amount to the most significant action in decades to overhaul the nation’s gun laws.

The 80-page bill would enhance background checks, giving authorities up to 10 business days to review the juvenile and mental health records of gun purchasers younger than 21, and pour federal dollars into helping states implement so-called red flag laws, which allow authorities to temporarily confiscate guns from people deemed dangerous. The measure would also, for the first time, ensure that serious dating partners are included in a federal law that bars domestic abusers from purchasing firearms.

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