Picked mine up from Kodiak Defence — they just received a batch. They’re also offering versions with a Remington 870 adapter, so you can run an 870-style stock on the rifle.
I spoke with their rep, and they mentioned an upcoming configuration that will support TriggerTech triggers along with a mil-spec stock interface, which should open up more customization options.
The rifle comes with a threaded barrel (on the polymer version).
Regarding .223 vs 5.56: the manufacturer warranty covers .223 Remington only, but many users are running 5.56 NATO without issues. As always, stick to quality, North American-manufactured ammunition. Older surplus (especially inconsistent or unknown origin) can lead to reliability or pressure-related concerns.