Federal Buildings Firearms Prohibition

Disclaimer: This information is for educational purposes only and does not constitute legal advice. Always consult current federal law and seek qualified legal counsel for specific situations.

Why it matters: That quick trip to the post office can land you in federal prison if you're carrying—even with a concealed carry permit. 18 U.S.C. § 930 doesn't care about your permit status, and violations are federal crimes that stick with you forever.

• I've seen too many good people get jammed up because they forgot they were carrying when they walked into a post office. The feds take this seriously, and ignorance isn't a defense.

The legal reality: Federal law prohibits firearms and dangerous weapons in most federal facilities under 18 U.S.C. § 930. This covers every federal building where employees regularly work—post offices, Social Security offices, IRS buildings, military recruiting stations, federal courthouses, you name it.

• The law casts a wide net. "Dangerous weapons" includes:
• All firearms (concealed or open carry)
• Pepper spray and mace
• Stun guns and tasers
• Knives (depending on agency interpretation)

Between the lines: The prohibition extends to the entire federal property, not just inside the building. That parking lot at the post office? Still federal property. Your car in the IRS office parking lot? Still illegal.

• Federal facilities are supposed to post signs at public entrances referencing § 930, but don't count on seeing them. The law applies whether there's a sign or not.

What this means for you: Before you leave the house, think about where you're going. Mailing packages, visiting Social Security, meeting with the IRS—all potential federal facilities where your carry gun becomes a federal crime.

• Penalties aren't slaps on the wrist:
• Up to one year federal prison for simple possession
• Up to five years if they think you intended to use it
• Permanent federal record that affects future gun ownership
• Substantial fines that'll hurt your wallet

Who Gets a Pass

Law enforcement officers acting in official capacity get exemptions, but that's narrower than most cops think. Off-duty doesn't automatically count, and retired LEOs aren't covered unless they're on official business.

Recent court challenges have questioned parts of this law, especially regarding post offices. Some federal judges are pushing back, but until the Supreme Court weighs in definitively, assume the law applies everywhere federal employees work.

Real-World Advice

I keep a mental map of every federal building in my area. Post offices are the biggest trap—they're everywhere, and you visit them for routine stuff. That Social Security office where your mom needs help? Federal building. The IRS office for your small business questions? Federal building.

The bottom line: When in doubt, leave it at home. The inconvenience of being unarmed for 30 minutes beats federal prison time and losing your gun rights permanently.

• Some folks try the "keep it in the car" approach, but that parking lot is still federal property. You need to be completely off federal land—find a parking spot across the street or down the block.

What's next: Court challenges are working through the system, and post offices might see changes first. But don't hold your breath—federal bureaucracy moves slower than government ammo procurement. Plan like the current law will be around for years.

Don't Fall for These

• "My permit covers federal buildings"—Nope, federal law trumps state permits
• "No sign means it's okay"—The law applies regardless of signage
• "Just the building interior is restricted"—The entire property is off-limits
• "Recent court cases fixed this"—Cases are pending, law is still in effect
• "Only applies to guns"—All dangerous weapons are covered

Resources

• 18 U.S.C. § 930 - Full text of federal law
• DHS FAQ on Prohibited Weapons at Federal Facilities
• National Archives - Items Prohibited in Federal Facilities
• Local federal facilities - contact individual buildings for specific policies
• Qualified attorney - for legal advice on specific situations

Last Updated: 2026-01-15

See Also

• Gun-Free School Zones Act
• Texas Prohibited Places (30.06/30.07)
• LEOSA: Retired Law Enforcement Officers

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Read the original article in The Handbook | By Boise Gun Club Editorial Team

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Join the Discussion

Have you had to adjust your daily carry routine because of federal building restrictions, or does it not really affect your normal spots?