The ‘Whisper’ cartridges were an underground success of sorts, but very few end-user deployments.
With AAC’s backing and factory fodder from Remington (and at least one smaller-batch maker in talks), the Blackout should be able to make the leap.
Hopefully at least one manufacturer will produce a reliable, affordable 16" upper to assist with the cartridge’s success outside of the .mil/.le/.NFA world.
I am so glad to see this, Baer’s 6x45mm, and other standard-platform larger-bore AR chamberings becoming popular.
In ‘related news’ I’ve seen AWC’s new subsonic 9mm 158gr (loaded by TTI armory) in the stores. Cool box, vanilla load. Winchester headstamp FYI.