The brush tool sources have been leaked 
Reference: https://www.youtube.com/watch?v=JKOQnf2szWI&t=630s
These are the brushes Morphed used for weapon and item model textures.
Here the brushes he used to texture in Photoshop:
https://getbrushes.com/photoshop-brushes...rushes.php
https://www.deviantart.com/mrnadeemzahid...-363894967
https://www.deviantart.com/javierzhx/art...2-39569777
https://www.deviantart.com/keren-r/art/D...s-24237007
https://www.deviantart.com/keren-r/art/G...4-20305496
https://www.deviantart.com/keren-r/art/S...s-23272015
https://www.deviantart.com/vpdesigns/art...1-11196003
https://www.deviantart.com/psbrushes/art...2-17754068 (distributed by psbrushes)
I attach here a zip file with all these resources in case of broken links.

Reference: https://www.youtube.com/watch?v=JKOQnf2szWI&t=630s
These are the brushes Morphed used for weapon and item model textures.
Here the brushes he used to texture in Photoshop:
- Digea Brushes:
https://getbrushes.com/photoshop-brushes...rushes.php
- JavierZhX (aka Blatzer) brushes:
https://www.deviantart.com/mrnadeemzahid...-363894967
https://www.deviantart.com/javierzhx/art...2-39569777
- KeReN-R brushes:
https://www.deviantart.com/keren-r/art/D...s-24237007
https://www.deviantart.com/keren-r/art/G...4-20305496
https://www.deviantart.com/keren-r/art/S...s-23272015
- Sphu brush:
- VPDesigns brushes:
https://www.deviantart.com/vpdesigns/art...1-11196003
https://www.deviantart.com/psbrushes/art...2-17754068 (distributed by psbrushes)
- Grunge brush:
I attach here a zip file with all these resources in case of broken links.