Undetectable Firearms Modernization Act

# Undetectable Firearms Modernization Act (HR 4221) - Summary **What the Bill Would Do** This bill would update existing federal law that prohibits undetectable firearms—guns that cannot be identified by metal detectors or X-ray machines. The legislation modernizes these restrictions to address changes in manufacturing technology, particularly 3D-printed firearms and weapons made with new materials that current detection methods might miss. The bill aims to close potential gaps in security screening at airports, federal buildings, and other sensitive locations by ensuring that the definition of "undetectable" keeps pace with evolving manufacturing capabilities. **Who It Affects and Key Provisions** The bill would impact manufacturers of firearms, particularly those using 3D printing or alternative materials, as well as anyone attempting to bring such weapons into secured areas.

It would likely establish updated standards for what makes a firearm "detectable" based on current and emerging security technology. The bill maintains existing restrictions while ensuring they remain effective against newly developed manufacturing methods that could circumvent original regulations from the 1980s. **Current Status** As of now, HR 4221 is in committee and has not advanced to a floor vote in the House. The bill was introduced by Representative Madeleine Dean (D-PA) and remains in the early stages of the legislative process.