Welcome Preppers and Survivalists,
There is still the possibility that we (you and your family) will face a restriction on owning firearms, in the near future.
So, ... Some people have taken to storing firearms, magazines, and ammunition that were purchased from private parties. In other words, no paper trail that leads to you.
Needless to say, some of us don't have the time or money to make that happen, so we will have to rely on ...
The Home Gunsmith - Home
US Crow - Manufacturing Instructions for Improvised Weapons
The Firearm Blog - DIY Sten Gun
Needless to say, technology, like 3D printing, allows some people to make their own sophisticated firearms.
WeaponsMan - 3d Printed 1911 (in .22LR Caliber)