I was recently contacted by Black Label Holsters, who obviously make holsters by trade. However, they are releasing some new replacement barrel nuts for your existing popular handguards.

These are currently made for the Noveske NSR, SMOS GFY, and Bravo Company USA KMR/A Handguards.

The Barrel Nuts are all MIL-A-8625 Type II Anodized and are made from aluminum. They've been tested to 90 ft-lbs of torque

Weights: (by my scale)

Noveske .8oz
SMOS .85oz
BCM .55oz

By comparison, a standard SMOS GFY Steel Barrel nut I have on hand is 2.8oz

SMOS
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BCM
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Noveske
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Black Label Holsters doesn't have their website up yet, but you can contact them at blacklabelholsters@gmail.com or through their Instagram blacklabelholsters: https://www.instagram.com/blacklabelholsters/