It's not that complicated to replace a trigger. Install it wrong and it simply won't work. Check out the SOTAR (School of the American Rifle) forum. Lots of good videos and info there. Check out the LaRue MBT trigger. $90, and I like it as much as my Geissele triggers. Take the money you saved, and take a SOTAR class. You will not be disappointed.
https://www.mdshooters.com/forumdisplay.php?f=227
THIS. A SOTAR class is worth every penny. I have Geissele triggers in most of my AR’s, one SSA-E and several G2s in other ones. I’ve shot the LaRue MBT as well and it’s excellent for the money.
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