Modifying a firearm by adding an illegal device that overrides the original, intended function or design to render a semiautomatic firearm into an automatic firearm is a felony. That includes importing, possessing, making or selling a machinegun conversion device (MCD). It’s a violation of the National Firearms Act (NFA) and carries a prison sentence of up to 10 years and up to $250,000 in fines.
There are certain modifications that NSSF warns gun owners they should never make to their firearms. In fact, it’s part of NSSF’s 10 Firearm Safety Rules:
Don’t Alter or Modify Your Gun, and Have Guns Serviced Regularly
Law enforcement notes that there has been increasing numbers of illegal MCDs recovered at crime scenes. NSSF, and the firearm manufacturers, retailers, and ranges we represent, all want firearms of all sorts to remain beyond the reach of those who should never possess them. That includes criminals who illegally modify firearms as well as those that use firearms for illicit means.
Personalizing a firearm to fit a lawful user’s needs can be done. Gun owners, we know, are overwhelmingly safety-conscious and law-abiding. There’s nothing wrong with making your new gun “your own.” Modifying a firearm by attaching illegal devices, however, should never be an option. Keep it on the “Right Side of LegalTM.”
Most gun owners, and many non-gun owners, know about the four basic safety rules. They are:
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- Always keep firearms pointed in a safe direction.
- Treat all guns as though they are loaded.
- Keep your finger off the trigger until you are ready to shoot.
- Always be sure of your target and what’s beyond it.
- Use Correct Ammunition
- If Your Gun Fails to Fire When the Trigger is Pulled, Handle with Care!
- Always Wear Eye and Ear Protection When Shooting
- Be Sure the Barrel is Clear of Obstructions Before Shooting
- Don't Alter or Modify Your Gun, and Have Guns Serviced Regularly
- Learn the Mechanical and Handling Characteristics of the Firearm You are Using
NSSF included six more firearm safety rules. They are simple and most gun owners know and already follow them. They’re worth reviewing. Knowing, and following them, keeps everyone safe.