Hi - I've googled inet and can't find any definite answer to this. I did find a set of pics of all the constituent parts of the A17 group that I can send/post if there is interest. A 5-page doc/pdf with part-names.
I'm trying to find a better OR additional way to improve the trigger-pull. I have done the V-spring and have a pull that runs from 2#9oz up to 3#7oz = Avg 3#2oz. per Wheeler Digital.

This has been a continuing Quest since I bought the rifle and found the 5# pull OEM.

MANY THANKS,
ED