| The Revi 16A was used in turrets and hand held weapons, it has a connector on the rear upper right side for the electrical plug. (There are a few pics of Revi16A's used in the cockpit, but this wasn't standard issue.)
The Revi 16B was used in the cockpits of aircraft, it has an electrical contact pad on the bottom right and connects using a mount specifially built for it.
The knob on a Revi 16D is used to adjust the reticle up or down for firing missiles or dropping bombs. Basically it adjusts for range of different weapons.
Regards,
Mike | 
Linear Mode
