Yeah, so are the Howa Minis. Thats partly what leads me to expect a RAR in 6.5G to follow the x39.Cz makes the 527 in the Grendel, and its the same gun as the carbine, maybe a very minor profile difference in the barrel.
Something I didnt think about it when i was considering the feeding of the Mini-30 magazine and the 6.5G.
Since they are already using the AR magazines in the .223 variant it would be as easy as slapping a Grendel barrel on the x39 receiver and bolt, and droping that into an AR maged stock.
Honestly if they DONT do that before i have money to spend on a new rifle, Im likely to see if ruger will sell me an x39 barreled receiver and a ar mag stock. That way i can have a heavy, long (for the grendel) barrel made, and have a swap barrel gun.
This is of course assuming all the parts are interchangeable.....having not had either variants in my hands or apart yet I cant say for certain.