The "Freedom from Improper Regulation and Enforcement Act," or FIRE Act, seeks to prohibit all capacity-based restrictions on firearm magazines across the United States. It amends chapter 44 of title 18, United States Code, to prevent both federal agencies and state or local governments from imposing any limitations or prohibitions based on a magazine's capacity. Specifically, the bill states that no federal officer or employee may enforce regulations related to firearm magazine capacity, and it declares that any existing or future state or local laws imposing such restrictions will have no legal force or effect. The legislation also includes definitions for "firearm magazine" and "capacity" to clarify its scope and ensure consistent application, with its provisions taking effect 30 days after enactment.