It was only a matter of time before a dark horse appeared from the East to challenge the 300 AAC Blackout. A few days ago, at the Big 3 East Media event in Florida, the challenger appeared when Wolf Performance Ammunition introduced their new 9x39mm Wolf cartridge. It’s a cartridge many hardcore Combloc collectors and video game buffs have hoped for, but never actually expected to see reach US shores. Developed for Russian Spetsnaz units, the 9x39mm started life as a specialized military cartridge for use in suppressed weapons. It was designed as a replacement for the subsonic 200-grain FMJ 7.62x39mm load fielded with suppressed AKM rifles. Combat experience in various hot spots around the world, including Afghanistan, led the Russians to desire a cartridge with improved terminal performance and penetration. While the subsonic 7.62x39mm load worked, Spetsnaz units found its performance lacking. They wanted something better.

Read more: http://www.firearmsnews.com/ammo/wolf-performance-ammunitions-new-9x39mm-wolf-cartridge/#ixzz4vJfp2ze2

Wolf is supposed to offer an AR upper for this cartridge.  If the ammo is relatively cheap, I might have to give this one a try.  I'm sure it won't be for a while though. 

A comparison, L to R, 9×19, 5.56×45, 7.62×39, 300 BLK super and subsonic and 9×39 Wolf.

Interesting cartridge
New to me
I'm always looking at different AR configurations
I'll be watching to see how this pans out
Thanks for the info