Well, I thought I had a Tapco FCG in it, but it turns out it is the original Century "C" marked one they put in for 922R compliance. Trigger pull isn't bad, but I found someone online that had NOS Tapco G2s for $32 and ordered it.
On a side note, I had fits trying to get the old FCG out. One, the Century FCG will not let you remove the safety lever before taking out the trigger assembly. Second, the previous owner had used superglue on the retaining spring (odd design I have never seen before) for the FCG pins! It was glued in place on the inside of the receiver. I finally got the spring loose, so the pins can easily be removed like they should.