Sig MPX in 300 BLK -- is this the PDW that we have been seeking?

[LRRPF52]

The 300 Blackout (BLK) is a .30 caliber bullet in a .223 Rem case

The articles by one of the members of this group on PDWs has stated that the goal is to have a weapon that can hit out to 200m with a 5" barrel. Thus 9mm or any other current pistol round is not going to meet the standards.

I've been shooting it since it was 300 Whisper, way before AAC came along. I was pointing out that the cartridge you described as 300 BLM (7.62x45), is not one I've heard of before.

JD Jones of SSK introduced it a long, long time ago as the 300x221 Fireball. That's where I first saw mention of it, before getting some trigger time with it suppressed. There are people who have been working with the cartridge for many years before the latest generation of the cartridge.