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Undetectable Firearms Modernization Act
7/16/2025, 4:23 AM
Summary of Bill HR 4221
Congressional Summary of HR 4221
Undetectable Firearms Modernization Act
This bill strengthens the detectability standard for firearms under federal firearms laws.
Current law requires firearms to be detectable by walk-through metal detectors after the removal of grips, stocks, and magazines. Specifically, firearms must be as detectable as a security exemplar (i.e., a piece of stainless steel that is 3.7 ounces and in a shape resembling a handgun). There are exceptions, including for firearms manufactured for or sold to U.S. military or intelligence agencies.
This bill requires firearms to contain detectable material after the removal of all parts other than major components. It defines detectable material as material that produces a magnetic field equivalent to that produced by 3.7 ounces of stainless steel. The bill also revises and broadens the exceptions to include firearms (1) received by, in the possession of, or under the control of the United States; or (2) produced pursuant to a contract with the United States.
Read the Full Bill
Current Status of Bill HR 4221
Bipartisan Support of Bill HR 4221
Total Number of Sponsors
1Democrat Sponsors
1Republican Sponsors
0Unaffiliated Sponsors
0Total Number of Cosponsors
0Democrat Cosponsors
0Republican Cosponsors
0Unaffiliated Cosponsors
0Policy Area and Potential Impact of Bill HR 4221
Primary Policy Focus
Alternate Title(s) of Bill HR 4221
Comments
Lance Caldwell
9 months ago
This bill sucks. It's gonna mess things up for me in the long run.
Trinity Payne
9 months ago
This bill is just what we need to keep us safe from those sneaky undetectable firearms. Can't believe it took this long to update the law! #abouttime
Kinslee Dixon
9 months ago
So, they're trying to update that old invisible gun law from the 80s? Seems like a waste of time to me. How will this actually impact us in the short term?
