Here is what I found on the Northland Shooter Supply website. As you can see the dual port comes in both the 3.4 and 4.4 action screw spacing, but it looks like one with a 6br or 308 would be a 4.4 spacing. So if you find a used action or rifle to buy you would just have to confirm it matches your stock that you already have.
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Action Configuration Options and Cost:
Cost: TEMPORARILY SOLD OUT
Right Bolt - Dual Port
Large Shank
.308 Bolt Face
AccuTrigger
Trigger Guard
4.41 Action Screw Spacing
Designated Action
Cost: TEMPORARILY SOLD OUT
Right Bolt - Dual Port
Large Shank
.223 Bolt Face
AccuTrigger
Trigger Guard
3.44 Action Screw Spacing
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