The U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives is asking people to post photos of their gun parts on social media.
A gun can be made of many different materials, but its parts have to be made from a certain material.
Here’s how to make your own gun parts.
The ATF has also issued guidelines to make parts from wood, plastic, metals and plastics.
These materials are used in a wide range of products and are generally used in the production of firearms.