I had the Magpul enhanced on ALL my AR's (including my MR lower). They worked fine. I have since swapped them ALL out for the KAC winter trigger guard. The both use the same standard role pin in the rear. The magpul uses a set screw and an Allen wrench for the front. The KAC has the standard push button as with the standard mil-spec. The KAC was preferable as I have a few Redi-Mod's and the Magpul trigger guard had to be completely removed to install/uninstall the Redi-Mod. The KAC swings down out of the way.
Much like the takedown pin thing, my preference boils town to ease, simplicity and fewer tools.
Green one has KAC guard on the HK lower
FDE one on the right has Magpul (got changed last week)
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