If you're using the rifle in a competition then the RRA NM is pretty good, though folks have reported that they do degrade pretty fast. I had one lose it's first stage after about three years.
I just swapped a different RRA NM trigger for an ALG ACT trigger with the JP spring kit. For a cheap-ish trigger, it is really nice. I understand that the ALG QMS trigger is even better. You simply can't beat the price and you get mil spec durability.