Re: Timney trigger and FN SPR
I had a Timney in a First Gen Spr that I got rid of a while ago so I am going off a distant memory. I installed the Timney with a DBM from a newer SPR on that rifle and when I did so, I had to break of the dremel and clearance the hole in the top of the bottom metal where the trigger goes through. The trigger shoe itself sits further back relative to the triggerguard. You would not notice unless you took the rifle apart. I have no idea how this will translate to a hinged floorplate BM in an A3G.
That said. I have had great success with the Rifle Basix trigger, but all they really are is an "easier to adjust" stock type trigger...that said, they are super easy to set up.
But, as said above, I suggest you play around with the stock trigger before wasting $$$ and time on a new trigger.