Pod Guns. A simple solution to the MV-22 firepower problem.

In the above video you notice that the NH-90 has pod guns that are forward firing.  This same system applied to the MV-22 might be a more satisfactory solution to the issue of MV-22 firepower.

The issue that brought the turret system to the airplane is the worry about being able to provide defensive firepower when entering landing zones.

This might be a cheap- low cost-solution to that problem.