The Black Hole nut looks pretty slick. I'd probably rather have a trued nut from Northland.
I've used the SSS from Gunshack it's $20. I wrote a review a while back on the Gunshack site and they never posted it. It looked a little cheezy with a ground bolt epoxied in for receiver alignment. It was less than .002'' difference from top to bottom and it was deadnuts where it counts.
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