If your rifle comes w/a fully shrouded (under the firing pin) bolt carrier, see if you can find someone who has an AR w/the cutawy version, and borrow his for the test. Generally, the shrouded type, which duplicates the profile of the original M16 carrier, is condidered more reliable, than the cutaway types, which were implemented by Colt early in the AR15 production run for political correctness. Recent production by all the major manufacturers, including Rock River, has shown a return to the original shrouded type.
Interestingly, it was Colt that first instituted the cutaway carrier and notched hammer---and all the aftermarket makers followed suit. Now, nearly 40 years later, Colt abandons the cutaway----and all the aftermarket makers are following suit [:D]
If your rifle arrives with a hammer notched at the top front corner, and you can see the rear of the firing pin from the bottom of the bolt carrier, your rifle will almost certainly pass the test. If the hammer does not have the notch at the corner, and/or the firing pin is covered upwhen looking from underneath, then it MAY NOT pass. There is no certainty about that, however. Holding down or removing the disconnector will certainly allow the hammer to fall on the return stroke of the action, but it will be riding the underside of the carrier, will not hit the firing pin with anything like a full force, and unless the ammunition has extremely sensitive primers, you'll end up with a chamber loaded rifle that has the hammer down on a live round.
Since all the aftermarket makers are using up their previous stocks of cutaway stuff here and there, I'd sit tight until you see what Rock River put into yours, before getting too antsy.[:D]