Thanks all y'all.
It was actually pretty simple
Well it only took a couple of tries...
The base coat is regular old Duplicolor Gray Hotrod Sandable Primer. I tried the technique over black primer and Khaki Camo paint first but gray worked out best.
The trick is it is hand painted ink mixed wet on the piece.
To further elaborate; I first tried doing patterns like one would normally do camo but it looked like I just hand painted it on(in other words kinda crappy) also it was over the khaki color. I then just went to the black primer I have been using and just slathered on 4 different colors of india ink and they basically mixed themselves into a neat finish and dried together well.
So I sprayed all the bits I wanted in that finish in the grey hotrod primer , stuck 4 paintbrushes in 4 pots of ink and started making patterns.
Tips and tricks; I found that the dark colors would tend to overwhelm the overall mix so it is best to put them on first (rather sparingly) and use the lighter colors to blend the patterns .
Also keep a bucket o water to clean your brushes as you blend the colors. With inks it kinda don't matter if you get a little yellow in your violet but it makes a BIG difference if you get teal or violet in your yellow.