The Defacto Action is a Tikka footprint action that utilizes a 700 style trigger.
As a Tikka does, this action will take some semi-long action cartridges like .30-06 and 6.6x55 swede. It is only available in .223 and .308 sized bolt faces.
Barrels are prefit style and available from IBI. They are neither shouldered as per normal, NOR do they use a barrel nut. Instead they shoulder internally inside the action. Both steel and carbon barrels are possible in lots of calibers.