Step 1: Go to private match and hit Create Class.

Step 2: Select any of the Class Slots and click COPY
Hover over Copy DONT do anything Else then have your
Friend Back out of the private match.

Step 3: Now with the background Menu goto Create Class
and select a class.

Step 4: While in create a class goto Primary and select any shotgun then hit done untill you reach the camo's
Once there hit (B) then copy the class to a different slot.

Step 5: After you hit Copy you should be hovering over
Primary Click on primary select whatever weapon you want Proficiency on, Pick the gun you should now see wich proficiency Menu.

Step 6: next what you want to to is keep Hitting the B button until you see the proficiency Menu again this time with damage option from the copied Class.

Step 7: Pick whatever proficiency you Want and Enjoy

Thanks for Reading,

Demize iG