hi, i got an Arsenal SGL-21 with a stock FCG.  The only thing I did internally was to yank the sheperd's hook and put in a Tapco retaining plate.

The first stage of the trigger has always been "gritty".  I put white lithium on the areas the single hook and the hammer make contact.  it improved it a bit, but not enough.  If possible, I was wondering if you would be able to smooth out that action and how much would it cost? 

I like the idea of a two stage trigger vs the Tapco trigger's one stage, which is why I was wondering if the stock one could be improved at a reasonable price....  i don't know what a job like that would run.

Thanks.