I would agree with the XM177/M4/M16A1 group. But I would put my own spin on it. I'd use a suppressed 605, like my Brownells replica. I have old eyes and I've used a Gen 1 RMR w/ Scalarworks mount on a PRI carry handle. If somebody comes up with the closed emitter 1X prism, I'd buy it and try it. Ever read any of John Stryker Meyer's stuff like "Across the Fence"? Don't know if I could carry 600 rounds in a jungle like Tilt did.