Which change to a firearm is prohibited without the Registrar's written permission?

Which change to a firearm is prohibited without the Registrar's written permission?

• A. Changing the serial number
• B. Changing the color
• C. Replacing the stock
• D. Adjusting the sights

Answer: (A)

The main idea is that legality hinges on what changes affect the firearm’s identifying features. The serial number is the firearm’s unique identifier used for tracking and law enforcement. Altering or removing that number without explicit authorization obscures ownership and traceability, so it’s prohibited without the Registrar’s written permission. The other changes—changing the color, replacing the stock, or adjusting the sights—don’t alter the firearm’s core identification in the same way and are not restricted in the same manner.

The main idea is that legality hinges on what changes affect the firearm’s identifying features. The serial number is the firearm’s unique identifier used for tracking and law enforcement. Altering or removing that number without explicit authorization obscures ownership and traceability, so it’s prohibited without the Registrar’s written permission. The other changes—changing the color, replacing the stock, or adjusting the sights—don’t alter the firearm’s core identification in the same way and are not restricted in the same manner.