For the guy who asked about using a Larue MBT 2S trigger in a Ruger 556....for what it's worth...I just installed the MBT 2S in my Del-Ton AR and my Ruger 556...absolutely love this trigger. Easy smooth takeup...hit a definite wall, then breaks crisp..no guessing about when it's going to break. Great for both bench rest and if ever needed for defense. Not so light as to get an unintentional discharge, but light enough to be more accurate at the range. I'd recommend highly.
For the price, you really can't beat the LaRue MBT-2S. They are really nice triggers. I've been swapping out all of my milspec triggers for the LaRue, and couldn't be happier.