RRA, especially match barreled ones are stupidly accurate out of the box, though.
Their barrel profiles can make the gun bloody heavy though. If you're sitting on a hill top picking off bunnies/hares/pest of choice from a bipod or pack, they're fantastic. If you're dragging one on a three day hike into your hunting spot, then they won't be so flash.
Like anything, it boils down to picking the right tool for the job. The great thing about ARs is that you can always have a varmint upper, and a lightweight bush-bashing upper and just fit the upper that is best for the job.
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