The C4 is pretty unique. There are three options for elevation...

1. You can run it with an exposed MOA turret.

2. You can run it with an exposed CDS turret.

3. You can remove the exposed turret and get a cap and run it like a standard scope.

The MTAC has different dials, but I have not seen them in person. I personally have no use for a CDS type dial. Just as easy to refer to a drop chart.