Where do you find these 3D models for the guns

Before I start, i do not condone the use of these as weapons to kill living people, download and print responsibiliy.
First is fosscad github repo:
github.com/maduce/fosscad-repo
Next is fosscad website:
fosscad.org/fc/cad/
Simple google search:
www.lmgtfy.com/?q=3d+printed+guns+download
These are not currently up but posting them anyway:
defdist.org
defcad.com
Another site:
www.printedfirearm.com
A bunch of useful site for is:
Grabcad
Wip