6mm ARC build

Since the election went well, I am going to build a 6mm ARC in the AR platform. I want this to be very accurate for varmint hunting.
For the builders out there, What barrel brand and model do you buy? I was thinking about getting a Proof Research Carbon Fiber for the weight. In 18 or 20 inch. I am open to others wisdom.

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Iā€™m running a Wilson Combat Stainless 18in and it shoots very well. Around 1/2 moa with Hornady Black.

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