Frequently Asked Questions About Ghost Guns April 2, 2021, 9:00 am Download the PDF here. This fact sheet will be periodically updated to account for new policy developments. It was last updated on April 2, 2021. Click What are ghost guns? Ghost guns are fully functional firearms that can be made at home using parts and kits that are available to purchase from gun dealers or through online vendors. The key component of a firearm is the receiver, which holds the parts that enable it to actually shoot, such as the hammer, bolt or breechblock, and firing mechanism. 1 Ghost guns are made using receivers that are not technically finished and require a few additional steps at home, such as drilling a few holes, before they can be used to make a functional gun. Kits and online tutorials for making guns using unfinished receivers have proliferated in recent years and do not require any particular technical expertise.