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

[LRRPF52]

The 300 BLM (7.62x45) seems to like shorter barrels where the 5.56x45 really needs a barrel longer than 14".

That is where the 300 BLK stands out is its love of shorter barrels.

Not familiar with that cartridge.

There's a Czech 7.62x45.

300 AAC Blackout is 7.62x35. Maybe you meant that and had a double typo.

5.56 NATO does very well out of 11.5" barrels, and 10.5" with the right projectile.