This bill requires the national instant criminal background check system, commonly known as NICS, to automatically alert U.S. Immigration and Customs Enforcement and state and local law enforcement whenever someone who is in the country illegally attempts to purchase a firearm. Currently, when the background check system identifies that a prospective gun buyer is illegally or unlawfully in the United States, there is no automatic notification mechanism to inform immigration authorities of the attempted purchase. The legislation would change this by requiring NICS to share relevant information from the background check with ICE and local law enforcement agencies whenever such an attempt is detected. The bill does not appear to include specific funding allocations or implementation timelines, leaving those details to be determined during the legislative process. This measure would primarily affect individuals without legal immigration status who try to buy guns, as well as the federal immigration enforcement agencies and local police departments who would receive these notifications.