This action is ready as is for 6.5CM. 6.5 & 308 share the same bolt face with most common short action calibers. You just need a prefit barrel from Bison tactical, Preferred barrels, Altus, Bugholes, Straight jacket, etc etc.
ETA: No changes to AICS 308 mags. No changes to bolt for 'common short action calibers'.
With this action you can go from a 16" 308 to a 24"CM with barrel swaps and no changes to the action. You could also extend that to 223-308-300win short with the bolt faces from bighorn. They'll even make custom bolt faces like 224valk or x39 (and preferred barrels makes a x39 barrel, kinda cool but expensive for crap russian surplus ammo).