# What are the legal implications of buying and selling illegal gun parts?

Natalie Fletcher · August 4, 2026

> The legal implications of purchasing illegal gun parts can vary significantly by jurisdiction. In the United States, federal law prohibits the sale and...

The legal implications of purchasing illegal gun parts can vary significantly by jurisdiction.

In the United States, federal law prohibits the sale and possession of certain gun parts, especially those that are designed to convert firearms into fully automatic weapons.

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The Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) regulates firearm components under the Gun Control Act of 1968.

This act categorizes parts like receivers and frames as firearms themselves, meaning their sale is tightly controlled.

The length of the sentence often depends on the nature of the offense and whether it involved trafficking or intent to distribute.

Ghost guns, which are firearms that can be assembled from kits or 3D-printed parts, often fall into the category of illegal gun parts if they lack serial numbers.

Laws regarding their regulation are rapidly evolving across various states.

In 2019, US Customs and Border Protection seized over 52,000 illegal gun parts that were imported.

These parts often include components that can be readily assembled into functioning firearms, further complicating the legal landscape.

Many websites that sell illegal gun parts often disguise their true nature by using misleading descriptions or images.

This makes it challenging for law enforcement to track and prosecute illegal sales effectively.

Under federal law, the intentional sale of illegal gun parts can trigger the "straw purchase" law.

This law holds individuals accountable if they buy firearms or parts on behalf of someone who is prohibited from owning them.

States like California have implemented stricter laws that classify certain gun parts as illegal, leading to proactive enforcement actions against sellers and buyers of these items.

In 2020, the ATF proposed new regulations that would classify unfinished frames and receivers as firearms, thereby requiring serial numbers and background checks for their sale, which created a ripple effect in the market.

The legal definition of what constitutes an illegal gun part can differ from state to state.

Some states have specific regulations prohibiting the sale of parts that can be used to assemble firearms without serial numbers.

Individuals charged with buying illegal gun parts may also face civil liabilities, including the loss of their firearms ownership rights and the potential for lawsuits from victims of gun violence.

The rise of online marketplaces has complicated the regulation of gun parts, as many transactions occur across state lines, which can lead to violations of both state and federal laws.

In some instances, individuals purchasing illegal gun parts can unknowingly become involved in larger criminal activities, such as trafficking or organized crime, which can increase the severity of legal consequences.

The ATF employs various methods to monitor and enforce laws regarding illegal gun parts, including undercover operations and surveillance of online marketplaces.

Legal precedents have shown that mere possession of illegal gun parts can lead to charges, even if the individual did not actively engage in selling them, depending on the circumstances surrounding the case.

Law enforcement agencies have reported that illegal gun parts often originate from international sources, which complicates efforts to enforce domestic laws.

The complexity of gun laws in the US has led to confusion among the public regarding what constitutes legal versus illegal gun parts, resulting in unintentional violations.

The use of technology, such as 3D printing, has introduced new challenges in regulating gun parts, as individuals can potentially manufacture untraceable firearms at home.

Recent legal challenges regarding the regulation of ghost guns have sparked debates over the Second Amendment and the balance between public safety and individual rights.

As of 2025, ongoing legislative efforts aim to establish clearer guidelines and regulations for the sale and possession of gun parts, reflecting the changing attitudes toward gun control in the US

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