Background

The Oerlikon 20 mm cannon is a light AA gun manufactured by the Swiss company Oerlikon Contraves. It was very popular and used by both the Axis and the Allies in World War II. It was frequently mounted on naval vessels.
Wikipedia Article if you want to read more

Capabilities

Pitch and Roll for aiming.

Gunner View is for regular use, Gunner View (Sim) is for SPVR.

This turret was designed with Funky Trees to allow Pitch and Roll to be used for aiming without snapping back as soon as you let go of the joystick. It also has continuous rotation. Due to this, it is much easier to track moving enemies.

The turret has a working gunsight and shield.

Gallery

A rear view of the turret.

The Oerlikon 20mm shooting down a hostile fighter.