I had an old style A5 e-grip that came with my ICP B5 kit, but it was missing the sear. Standard a5 sears with the elongated hole do not work with these style e-grips, the firing pin gets pinched when the sear slides back and forward.
Popped this new sear in and works like a charm! Thanks a bunch, this was the best price I could find on the net and shipping was actually sane for such a tiny piece.
Replacement for missing part 
