This legislation amends federal law to prohibit a Federal firearms licensee from selling or delivering specific types of firearms to individuals under 21 years old. The prohibition applies to semiautomatic centerfire rifles or shotguns that have, or can accept, an ammunition feeding device with a capacity exceeding five rounds. This measure aims to restrict access to these particular firearms for younger individuals. However, the bill includes important exceptions for "qualified individuals," defined as members of the Armed Forces on active duty and full-time law enforcement officers authorized to carry a firearm in their official duties. It also clarifies age requirements for other firearm types, maintaining the 18-year-old limit for most shotguns and rifles, and 21 for other firearms. An "ammunition feeding device" is broadly defined to include magazines, belts, and drums, excluding certain .22 caliber rimfire tubular devices. Additionally, the Act mandates that the Director of the Federal Bureau of Investigation submit a report within 90 days of enactment. This report must detail the protocols and procedures for information-sharing between the FBI's public access line and its field offices. It also requires recommendations for improving these information-sharing processes.