The "Keep Americans Safe Act" proposes to regulate large capacity ammunition feeding devices (LCAFDs) by defining them as any magazine or similar device with an overall capacity of, or readily convertible to accept, more than 10 rounds of ammunition, excluding certain .22 caliber rimfire devices. This legislation aims to significantly restrict the availability and circulation of such devices nationwide. A central provision of the bill makes it unlawful to import, sell, manufacture, transfer, or possess LCAFDs in or affecting interstate or foreign commerce. Crucially, it includes a grandfather clause , permitting the continued possession of devices lawfully owned before the Act's enactment. Exemptions are also granted for federal, state, local, and campus law enforcement officers for official duties, nuclear facility security personnel, and retired law enforcement officers under specific conditions. Additionally, the bill mandates that all LCAFDs manufactured after its enactment must be identified with a serial number and date of manufacture . It also integrates LCAFDs into existing federal law concerning seizure, forfeiture, and penalties for violations. To facilitate compliance and reduce the number of these devices, the legislation authorizes the use of Edward Byrne Memorial Justice Assistance Grants to fund voluntary buy-back programs for large capacity ammunition feeding devices.