why was this law passed?

[IcyHotMonkey]

Here’s a list of the types of firearms that are generally illegal to own under federal law:

* Fully automatic machine guns
* Gun with an obliterated serial number
* Gun not detectable by a walk-through metal detector
* Shotgun with a barrel length less than 18 inches, or an overall length less than 26 inches
* Rifle with a barrel length less than 16 inches, or an overall length less than 26 inches
* Silencer

It's a good thing my silenced, fully automatic, 17 inch barrel, non detectable by metal detector, obliterated serial number with a detachable 15 inch rifle barrel shotgun is safely under my bed.