This model represents the early configuration of the World War Two-era, British-designed Mk II reflector gunsight normally fit to Grumman F6F-3 and F6F-5 Hellcat fighters, and F4U Corsair fighters. In US service, the gunsight was known as the "Mk.8".
The model includes the mount for the F6F Hellcat.
From aircraft-gunsights.com: "In 1941, the US Navy adopted the British GM2 Gunsight (designated the Fixed gun Reflector Sight Mk II) as the basis of their new standard Gunsight (designated the Mark 8 Illuminated Sight) for fighter and attack planes equipped with fixed forward-firing guns."
This model does not include the glass reflector plate of the real gunsight.
This model was designed by Brian Hannah.
Model © Brian Hannah. Model made available through Model Monkey by permission. This 3D-printed item may not be copied or recast.