Bushmaster is now offering an upper for the .300 BLACKOUT (aka 300 BLK or 300 AAC BLACKOUT) cartridge.  The uppers use a light contour barrel with a black Melonite coating.  Barrel length is 16″.

The AAC Blackout 51T ratchet mount flash hider is used on these uppers.  The upper receiver has a flat top with Picatinny rails for mounting a wide range of optics and iron sights.  The gas block is low profile and does not have a built in front sight post.

The handguard is a quad-rail allowing for the addition of many different accessories such as a white light or laser.  MSRP is $869.  In current market conditions, prices could be higher than the MSRP, assuming Bushmaster ships these in any quantity.