I just got off the phone with Bill Alexander of Alexander Arms (maker of .50 Beowulf and 6.8 Grendel ARs). Apparently 6.8 will work through a standard .223 upper, .50 won't (the case is too big to get out the ejection port).
However apparently 6.8 is a bit tricky to put together and get working right, its just fussy.
Any one have any experience putting together a 6.8 Grendel gun?
AE
However apparently 6.8 is a bit tricky to put together and get working right, its just fussy.
Any one have any experience putting together a 6.8 Grendel gun?
AE