Your piston looks like 45° and my trigger only works with 90° piston for now.
There are two ways that you can go: You could buy 90° piston or I could change piston catch in my trigger to accommodate 45° pistons.
Here is probably cheaper one 90° piston http://shop.ehobbyasia.com/upgrade-part/parts-upgrade-rifle/cylinders-pistons/action-vsr-10-piston-with-stainless-steel-rear-end.html
Or you can ask Ranger if he is able to make piston for you or modify your Edgi piston on lathe
In this page of V-trigger is described advantage of 90° system
On this pictures is shown difference between 45° and 90° system