The stock trigger in the GMR-15 is the JP "Easy Trigger" and when using the yellow springs with some armite lead based sear grease that came with my rifle, my pull weight is 2.75lb. I believe the new modular triggers are advertised at 3.5lbs but I have not got my hands on one yet. The stock easy trigger is so good I really don't care.
I did try a Hyperfire Eclipse and I would get some failure to cock or bolt follow so I went back to the stock trigger. I do wish they offered a straight trigger shoe like they offer on the new modular triggers for the Easy Trigger but only the roller trigger is available which I do not want for USPSA matches.