I am currently in the process of building a new intermediate 556. Building a mega .556 and going with a precision 18" barrel for this build. The sole purpose of this build isn't necessarily to be a tack driver, but do want it to be an above average accuracy wise all around reliable AR platform. My question is in regards to the optic for this build. I am leaning towards a new ACOG with a back-up doctors on it. But then I started really thinking about a new 1X4 with the same doctors on it. I will come straight out and say that I am unfamiliar with both set-ups, and could really use some real world advice. Thanks in advance for any info given. This set-up will primarily be used to hunt with, target shoot with, and I will probably carry it on duty if it turns out to be as accurate as I hope it will.