It was designed in advance to fire 5.56, 7.62, and 6.8 by only changing the barrel, magazine and boltface. Watch the video on the bushy site.
Changing calibers on a an ACR
No tools needed, finished in less than a minute!
I have a feeling the barrel conversions are going to cost a lot, considering the gun itself is so expensive. They seem to be taking their time putting them out. Why market a gun on it's ability to change barrels then not have any available?