The trigger layout is unique. It has 4 adjustable points, one being the spring.
The fun part is the trigger will be able to be rapid prototyped. We will have the trigger files for a few types out, and in addition to that we will have the files open for anybody to modify and use. Then anybody with a bit of skill can print out a custom one.
We printed out several with our extruder type 3D Printer and they are quite light and strong. So any style you might want can be done.