Maxim is the only source Ive seen for left hand 6.5 Grendel bolts and Stag used to sell left hand eject upper receivers. Ive never seen a requirement for a specific left hand bolt carrier. You might check Rainier Arms for a side charging upper receiver.
http://www.maximfirearms.com/online-stor...left-hand/
You might look at this left side eject upper.
https://www.rainierarms.com/devil-dog-co...ng-handle/
http://www.maximfirearms.com/online-stor...left-hand/
You might look at this left side eject upper.
https://www.rainierarms.com/devil-dog-co...ng-handle/

