Full Report
In the wake of Luigi Mangione’s alleged killing of a health care CEO with a partially 3D-printed pistol, we built the exact same weapon ourselves—and test-fired it.
Analysis Summary
# Main Topic
The analysis and replication of a partially 3D-printed firearm, similar to the one allegedly used by Luigi Mangione to kill UnitedHealthcare CEO Brian Thompson, to assess the feasibility, performance, and regulatory implications of privately manufactured, untraceable "ghost guns."
## Key Points
- The author successfully printed the frame of a Glock-style handgun and assembled it with commercially available metal and polymer components.
- The experiment involved building an exact clone of the alleged murder weapon, including a 3D-printed silencer wrapped in black hockey tape.
- The assembly process was noted as "finicky," similar to assembling small furniture, requiring guidance from a 3D-printed-gun aficionado (YouTuber "Print Shoot Repeat" or PSR).
- The replicated weapon fired successfully over 50 times during testing prior to a catastrophic failure (a lodged round in the barrel), demonstrating dangerous lethality.
- The construction of such a firearm leverages a loophole where only the frame (for Glock-style guns) or lower receiver (for AR-15s) is regulated as "the gun," allowing the rest of the components to be purchased online without regulatory checks.
- The experiment highlights the advance in 3D-printed gun technology over the past decade, as previously, 3D-printed AR-15 receivers were considered unsafe by gunsmiths.
## Threat Actors
- **Luigi Mangione:** Alleged perpetrator in the high-profile assassination of CEO Brian Thompson using the weapon in question.
- **Print Shoot Repeat (PSR):** A known 3D-printed-gun aficionado and YouTuber who advised the replication process.
## TTPs
- **Untraceable Firearm Construction:** Utilizing 3D printing for the regulated component (the frame/receiver) of a firearm.
- **Component Sourcing:** Purchasing unregulated firearm components (slide, barrel, trigger assembly) online without background checks.
- **Assembly and Testing:** Private assembly and rigorous testing of the DIY handgun, suggesting a level of practiced proficiency (racking and tapping the slide, troubleshooting).
- **Accessory Use:** Attachment of a 3D-printed silencer.
## Affected Systems
- **Firearm Component Regulatory Framework (USA):** The current legal system is failing to keep pace with DIY firearm technology, particularly concerning components like 3D-printed frames/receivers.
- **Victims:** Brian Thompson, UnitedHealthcare CEO (the initial victim in the related incident).
## Mitigations
- **Regulatory Reform:** The article implies the current gun control system is insufficient, suggesting a need to update regulations to account for privately manufactured and 3D-printed firearms.
- **Awareness:** Increased awareness among law enforcement (noted by the changed police response comparing this time to 2015) regarding ghost guns is an emerging mitigation factor.
- **Safe Disposal:** The author surrendered the self-made weapon components to a New Orleans police station, emphasizing the legal restriction against transferring self-made firearms.
## Conclusion
The experiment confirms that functional, lethal, partially 3D-printed handguns can be constructed privately in 2025 with relative ease, mimicking the performance of weapons used in serious violent crimes. The primary threat is the lack of legal oversight on the manufacturing process, suggesting an expected increase in untraceable ghost guns unless regulatory structures evolve to address advancing DIY firearm technology.