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I think it's going to be the Sig MCX. It's got lots of high-visibility contracts with governments across the globe, and there are good guys doing bad things to bad guys with them.
It has the ability to use lots of AR-compatible parts, so you're not waiting for weeks to get a safety repaired or pivot pin replaced.
It has the modularity that the firearms market has been looking for, and it hasn't been an abortion like the ACR.
I'm not going to sell any of my quality ARs to buy another (I have one on a Form 1 and one pistol built on a Rattler kit), but I would like to add a Virtus to the stable.
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When I read the OPs question the first gun that came to mind was the MCX. However, after having owned A LOT of SIG NH rifles (several copies of each: Sig556, Sig556 Classic, Sig556 Patrol, Sig556 XI, Sig MCX) I don't believe their QC and materials selection is up to the challenge of being America's next rifle. If they would license the manufacture to BCM, Colt, or Daniel Defense ... and allow the awarded contractor to conduct a design review and revision process (like upgrading the upper receiver to 7075-T6) ... the design could really take off.
Short of this happening, it is just going to be another (albeit better executed) ACR style abortion.
ETA: Where is the Sig556 series now ... and how did it compare the SIG SAN 550 series? I've had over a dozen different SIG NH rifles and they just seem "hobby grade" to me. I'd love to see the MCX get the attention it needs to be a great rifle, but I don't see Sig being the company that can pull that off.