I've had the ACT installed in my MR556 lower receiver for some time now. I really like this setup. The price point and the fact that it is a mil-spec FCG is a big plus in my book. Unfortunately, my 14.5" upper setup on the HK factory MR lower is neither my primary nor secondary setup, so it has yet to see any "hard" use. Upon initial installation, I had a 1.1-4x Short Dot on the gun. The ACT felt noticeably better than the factory FCG for precision fire. For the experienced shooter with good trigger control, the ACT can perform in this roll.
Some will compare the ACT to a properly "broken-in" mil-spec trigger pull. I don't think this does the ACT justice. Although my Colts (purchased just after the AWB ended) are properly broken in, they still have a touch of creep and a slightly heavier pull than the ACT. My only regret is that my Colts don't have mil-spec pins to allow me to switch all of my guns over to the ACT.



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