When we got together a few weeks ago, it was my first time touching an AR since a few hours out at Fort Dix when I was a kid in AFJROTC, and my first time ever with an RDS, I thought it was pretty easy to knock the 6" plate with your setup.
I was thinking that RDS + laser was the way to go too (not by experience or learning, just gut feeling); the value of a laser is well established, ditto for RDS. Indeed, irons for an AR are the same price as a laser...
J.Ja