Most of you have heard of the Franklin Armory Binary Trigger and the Fostech Echo trigger. Well there is a third company called Double Tap. They have been working on a double tap trigger for the KRISS Vector. Now I believe it is only for the second gen KRISS Vectors so if you have a gen 1 like me, then you are out of luck.
Just like the Binary and Echo, the Double Tap trigger is a pull and release trigger. One aspect of the Double Tap triggers is that they are only pull and release. There is no single stage like with the Binary or the Echo.
The KRISS Vector Double Tap trigger is not on the website just yet but hopefully it will be soon.