I shoot AR service rifles for National Match or High Power. I have 2 rifles one with the RRA 2 stage the other with a Geissele 2 stage. The rifle with the Geissele is my go to rifle while the rifle with the RRA is my backup rifle and/or loaner. (mostly a loaner)
The Geissele is adjustible for 1st and 2nd stage pulls. It even has an over travel adjustment. The Geissele can be found at
http://www.whiteoakarmament.com/index.htm
A little spendy maybe but it also comes with a handy pin alinement tool, oil and grease. The instuctions are easy to read. There might be a small amount of metal removal on the safety to get it to fit.
The Grissele trigger is sweet and pulls way better than the WOP tuned RRA.