Federal Firearms & Weapons Offenses: A Federal Defense Lawyer’s Guide

By Elizabeth Franklin-Best, Esq., and Christopher Zoukis, JD, MBA

Federal firearms charges carry severe, often mandatory penalties — and they frequently arrive attached to a drug case, a violent-crime case, or a routine traffic stop. If you are facing a federal weapons charge, an experienced federal gun crime lawyer is essential, because in this area, the difference between charges can be the difference between probation eligibility and decades of mandatory time. At Elizabeth Franklin-Best, P.C., we defend individuals against federal firearms allegations nationwide.

Federal firearms offenses are prosecuted principally under 18 U.S.C. §§ 922 and 924 — felon in possession, using or carrying a firearm during another crime, and straw purchasing and trafficking. Each has distinct elements, and several carry mandatory minimum sentences.

Our firm brings a federal-court defense practice grounded in detailed statutory analysis and controlling case law. Elizabeth Franklin-Best is a federal criminal and appellate attorney recognized in Best Lawyers for appellate practice. We approach every firearms case by scrutinizing the legality of the search, the proof of knowing possession, and every avenue to avoid a mandatory minimum. If you are facing a federal firearms investigation or charge, we invite you to schedule a one-hour initial consultation.

Federal Firearms Offenses: Quick Answer

Question	Answer
What are federal firearms offenses?	Weapons crimes under 18 U.S.C. §§ 922 and 924 — including felon in possession, using a firearm during a crime, and straw purchasing.
What must the government prove?	The elements of the specific statute, including knowing possession and, after Rehaif, knowledge of the prohibited status for § 922(g) charges.
What penalties can apply?	Felon in possession carries up to 15 years; § 924(c) carries consecutive mandatory minimums; the Armed Career Criminal Act adds a 15-year minimum.
Are firearms charges often added to other cases?	Yes. Federal weapons counts are frequently charged alongside drug and violent-crime cases, sharply increasing exposure.

Key Takeaways

• Federal firearms offenses are prosecuted under 18 U.S.C. §§ 922 and 924.
• Felon in possession under § 922(g) requires knowing possession and, after Rehaif, knowledge of the prohibited status.
• Section 924(c) — using or carrying a firearm during another federal crime — carries consecutive mandatory minimum sentences.
• The Armed Career Criminal Act imposes a fifteen-year mandatory minimum on certain repeat offenders.
• Firearms counts are frequently added to drug and violent-crime cases, dramatically increasing exposure.
• The Fourth Amendment is central — much firearms evidence comes from searches and stops.
• “Possession” requires dominion and control; mere proximity to a firearm is not possession.
• Charging decisions and mandatory minimum exposure make an early, strategic defense essential.

What Are Federal Firearms Offenses?

Federal firearms offenses are weapons crimes prosecuted by the federal government under Title 18, principally 18 U.S.C. §§ 922 and 924. While most weapons offenses are prosecuted under state law, the federal government takes cases involving prohibited persons, firearms used in connection with other federal crimes, illegal trafficking, and certain regulated weapons.

Two features define federal firearms practice. The first is the prevalence of mandatory minimum sentences — several firearms statutes set a sentencing floor that a judge generally cannot go below. The second is that firearms counts are very often add-on charges: a firearm found during a drug investigation, a traffic stop, or a violent-crime case generates a separate weapons count that can transform the defendant’s overall exposure. Understanding how a firearms count interacts with the rest of a case is essential.

The federal firearms offenses our firm defends are explained in depth in the guides below.

The Federal Firearms Statutes

• Felon in Possession of a Firearm Defense (18 U.S.C. § 922(g)) — the prohibited-person possession statute, and the most commonly charged federal firearms offense.
• Using or Carrying a Firearm During a Federal Crime (18 U.S.C. § 924(c)) — the statute that adds consecutive mandatory minimums when a firearm is connected to a drug or violent crime.
• Straw Purchases & Firearms Trafficking Defense — the prosecution of false-statement straw purchases and the trafficking offenses, including under the firearms-trafficking statute.

Firearms cases routinely intersect with our federal drug crimes practice and the broader field of federal criminal defense.

What “Possession” Means

Most federal firearms charges turn on the concept of possession, and it is more precise than it sounds. Possession can be actual — the firearm on the defendant’s person — or constructive — the defendant having the power and the intention to exercise dominion and control over the firearm, even without holding it.

What possession is not is mere proximity. A firearm found in a shared apartment, in a vehicle with several occupants, or in a common space is not automatically possessed by everyone nearby. The government must prove that the particular defendant knowingly possessed the firearm — that they had dominion and control over it. In multi-occupant settings, that is a genuine, contestable question, and it is one of the most important defenses in firearms cases.

Applied Insight: Constructive possession is where many firearms cases are won. When a gun is found in a car or a home used by more than one person, the government must tie it to the defendant specifically. Fingerprint and DNA results, the gun’s location, and access by others are all evidence the defense develops to break the chain to the client.

The Rehaif Knowledge Requirement

For the most commonly charged federal firearms offense — felon in possession and the other prohibited-person categories under § 922(g) — the Supreme Court’s decision in Rehaif v. United States added a significant knowledge requirement.

Before Rehaif, the government had to prove only that a defendant knowingly possessed a firearm. After Rehaif, the government must prove two kinds of knowledge: that the defendant knew he possessed a firearm, and that the defendant knew he belonged to the relevant prohibited category — for example, that he knew he had been convicted of a crime punishable by more than a year in prison. This requirement applies across all the § 922(g) categories.

In most cases, the government can prove a defendant knew of a prior felony conviction, but not always, and the requirement is an actual element the government must satisfy. It is one of several doctrinal tools a firearms defense uses, and it is explained in depth in our felon-in-possession guide.

Mandatory Minimums in Firearms Cases

Mandatory minimum sentences dominate federal firearms practice, and two provisions in particular drive the exposure.

Section 924(c) imposes consecutive mandatory minimum sentences — generally five, seven, or ten years depending on whether a firearm was used, brandished, or discharged — when a firearm is connected to a drug trafficking crime or a crime of violence. Because a § 924(c) sentence must run consecutively to the sentence for the underlying offense, it is added on top of everything else.

The Armed Career Criminal Act, § 924(e), imposes a fifteen-year mandatory minimum on a defendant convicted of felon in possession who has three or more qualifying prior convictions for violent felonies or serious drug offenses. Whether a prior conviction “qualifies” under the ACCA is a heavily litigated, technical question, and a successful challenge can remove the fifteen-year floor entirely.

Because these provisions can add or impose years of mandatory time, identifying every available challenge to them — to the § 924(c) predicate, to the ACCA prior convictions — is a defining task of federal firearms defense.

Applied Insight: Whether a prior conviction “counts” under the Armed Career Criminal Act, and whether a charged offense is a valid § 924(c) predicate, are intricate legal questions that have shifted considerably with Supreme Court case law. These are not technicalities — a successful challenge can erase a fifteen-year mandatory minimum or a consecutive § 924(c) term.

The Fourth Amendment in Firearms Cases

Federal firearms cases are, like drug cases, frequently search-and-seizure cases. The firearm is usually found during a traffic stop, patdown, vehicle search, or home search. The Fourth Amendment governs each of them.

A stop made without lawful justification, a frisk that exceeded its lawful scope, a vehicle search without probable cause or valid consent, a warrant unsupported by probable cause, or an unlawfully prolonged detention can each render the firearm inadmissible. When the firearm itself is the fruit of an unlawful search, suppressing it can end a firearms prosecution. A rigorous review of every stop and search is a priority from the first day of the defense.

Penalties for Federal Firearms Offenses

Penalties vary by statute. Felon in possession under § 922(g) carries a statutory maximum of up to 15 years. Section 924(c) carries consecutive mandatory minimums of five, seven, or ten years, and higher terms for certain firearms. The Armed Career Criminal Act imposes a fifteen-year mandatory minimum. Straw purchasing and firearms trafficking offenses carry their own substantial penalties. Fines, supervised release, and forfeiture of firearms also apply.

Above any mandatory minimum, the advisory United States Sentencing Guidelines drive the sentence, with the type of firearm, the number of firearms, the connection to other offenses, and the defendant’s criminal history all influencing the range. Because firearms counts are so often added to other cases, the combined exposure can be severe — and contesting the firearms count, the mandatory-minimum enhancements, and the Guidelines calculations is essential.

Defenses to Federal Firearms Charges

No two firearms cases are alike, and no lawyer can promise a result. But several defense themes recur, and matching them to the evidence is the core of building a strategy:

• Fourth Amendment violations. An unlawful stop, frisk, search, or warrant can render the firearm inadmissible.
• Lack of possession. The defendant did not have the dominion and control that possession requires; mere proximity is not possession.
• Lack of knowledge. The defendant did not know a firearm was present, or — for § 922(g) — did not know of the prohibited status.
• No valid predicate. For § 924(c), the underlying offense is not a valid crime of violence or drug trafficking crime.
• ACCA challenges. The prior convictions do not qualify under the Armed Career Criminal Act.
• Constitutional challenges. Developing Second Amendment case law has reshaped challenges to some firearms statutes.
• Mandatory-minimum and sentencing challenges. Contesting the § 924(c) and ACCA enhancements and the Guidelines calculations.
• Identity and attribution. The government cannot prove that the defendant, rather than another person, possessed the firearm.

The right combination depends entirely on the facts. Our role is to test the government’s proof element by element, develop a favorable record, and press every legitimate defense during the investigation, in pretrial motions, at trial, and on appeal.

Why Work With Elizabeth Franklin-Best, P.C?

Federal firearms cases reward defense lawyers who litigate the Fourth Amendment hard, who understand constructive possession and the Rehaif requirement, and who know how to challenge the § 924(c) and Armed Career Criminal Act mandatory minimums.

Elizabeth Franklin-Best is a federal criminal defense and appellate attorney recognized in Best Lawyers for appellate practice and the author of a book on challenging criminal convictions. Our team — including Christopher Zoukis, who focuses on federal sentencing and corrections issues — handles federal matters nationwide, appearing pro hac vice in district courts across the country alongside our standing bar admissions. We defend individuals at every stage of a federal firearms case.

We do not promise outcomes. What we promise is rigorous, honest, practitioner-grade defense work: a close reading of the law and the record, a candid assessment of the evidence, and a strategy built for your situation. If you are facing a federal firearms investigation or charge, we invite you to schedule a one-hour initial consultation.

Talk With a Federal Gun Crime Lawyer

A federal firearms charge can carry a mandatory minimum and can multiply the exposure of an underlying case. The earlier an experienced federal gun crime lawyer is involved, the more options you are likely to have. To discuss your circumstances confidentially with our team, schedule your one-hour initial consultation today.