These are standard mil-spec triggers made by BCM.
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.
Yes. The Bravo Company MFG Trigger Point Assembly will fit and function just fine in an AR9.
The trigger pull is about 5 pounds.
Yes, the trigger pins are included.
Yes, this trigger will fit into any standard AR-15 and AR-10 lower.
I havent gotten mine yet but I've seen it is a 4.5 to 5.5 pull weight but when it breaks in it's closer to 4. I think this model is double action model the single is I think PNT. optica planet doesn have it