I just did the "15 minute trigger job for m&p 15-22" and I'm pulling about 4 lbs now... its worth it and super easy. Youtube it and you will be able to do it in no time... hardest part is getting the hammer/hammer spring assembly back in place (a tip, look at it and where the spring catches in the lower before you take the pin out... that way you know where it should go back once you have modded it).
And 6 lbs to 4.2 is only 1.8 lbs difference. Not 3.
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