I have an old SmartParts Wooden Handle Grip with a
DUCKBILL ASA with a hole on both sides. On one side, I have a plug in the hole and on the other, a 90 degree macroline that goes up to the valve body at the back of my marker. I just got a M16 grip with an insert bottom line from another paintballer in a trade. I haven't even had the opprtunity to try installing it. I'll try the M16 Grip setup but I'll probably stick with my Woodie and ASA combination.
I HIGHLY reccommend the Trinity Thread Saver On/Off between the ASA and the HPA tank.
Below is the picture of my current setup

WoodsBaller57