Greetings Nanakuli!

Funny you seem unaware that illegally obtained firearms include those stolen from law enforcement personnel (think recently of both Honolulu and San Francisco), military members, some smuggled from overseas (Asia, Africa, South America and the Middle East) as well as some made by people with access to common machine shop tools such as drill presses and lathes (and 3-D printers if you've been keeping up with current events). 

You also seem ignorent of history and that guns have been made under conditions of severe scrutiny and hardship.  Resistance movements all over Europe and even in the Warsaw Ghetto built many and quite deadly firearms.  These guns may not have been very durable, but they didn't need to be to kill an Axis soldier and take his weapons.

By your reckoning, major U.S. prisons ought to be the safest place for you to live - ain't supposed to be any guns (or shivs) in the general prison population right?  But even tough guy that you are, would you?