One more thing to consider is hammer spring power.
I hope basic designs have changed since I used a single stage trigger in an AR (a Timney circa 2000 IIRC), but one of the problems I had was that in order to get a pull light enough to be an improvement over a smooth GI trigger, the hammer spring had to be so light that I got ignition problems. I didn't notice it until I put it in an AR10 and it refused to light milsurp 308 100% of the time.
What you should do is get one lot of match grade ammo and chronograph a minimum of 10 rounds with the old trigger and then do the same with the new trigger. If there are ignition problems, it will show up as a increased standard deviation in velocity.
