300 BLK AR barrel suppliers

[mstarling]

Guys,

One of my friends is mulling over the idea of building a 16" .300 BLK AR rifle.

My 300/221 16" 1:8 SS bbl was made by tp555. His work is impeccable but my buddy would like to evaluate the options. Who else is listing/supplying 300 BLK barrels for the AR platform?

Thanks,

Mike