Offered as the KMR, this is Bravo Company’s new KeyMod handguard. Made of magnesium and aluminum, this alloy is substantially lighter than a standard 6061 aluminum handguard while retaining the strength. From personal experience I can only relate the weight to basic polymer and some of the carbon fiber handguards, but without the worries of flex and fragility.
The handguards are expected very soon but will initially be offered only on uppers, with individual sales to follow.
Note the two different types (angled at top and single row above) of clip-on slot protectors shown, these improve the purchase of physical contact to the tube with a semi-agressive texture. These snap into the KeyMod slots.