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the Ruger ar556 uses a bolt carrier that is beveled, exposing the firing pin, where a normal carrier is ramped covering it. Ruger uses a shorter hammer with a notch. the bigger milspec hammer in the enhanced set will snag on the exposed firing pin. you will have to change your bolt carrier to the ramped version for it to run properly.
I'm not 100 percent sure but I'm 95 positive it will it's very standard. the only thing I've seen is that the rolling pins that come with it are for newer ars I believe they are .154 in size and some old ars from 90s or older I think use .164 pins and this wont work with it.