Ballistic fingerprinting is nothing more than the next step to registration and confiscation.
First, the traitors will try to pass a ballistic fingerprinting bill covering new guns.
Then, they'll pass a law making it illegal to modify an existing gun (new barrel, new bolt, etc....) without fingerprinting the modified weapon. In other words, you'll have to go through an FFL to get a replacement barrel.
Finally, they'll enact a law requiring all guns to get fingerprinted.