Sorry for the three year late reply but... I put this project away and worked on other stuff. It been a display piece only - sadly.
I took another look at it, made a few small adjustments, and took it to the range. Got it to work for two shots then the sear wore a groove in the hammer shelf... so I could fire it and kept the trigger pulled, and then fire it again by releasing the trigger... the FCG is done and its My fault.
The long and short is that I think this gripstick is crap and what I read on other postings I am not alone. Maybe someone out there got this version to work for them but I can't figure it out and don't want to waste my time trying to make it work. (its sad that a $200+ part doesn't work right out of the box)
My recommendation - if you have this version where the FCG does NOT work the second you put a factor FCG in it... stop and buy another updated version.