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This is a more accurate replacement of the cannons on on the Moebius 1/32 Cylon Raider. Their barrels are hollowed out to allow a 1mm fibre optic cable through for lighting. The cannon body is also large enough to hold an LED bulb so that FO may not even be necessary.
The cannons were recreated based on pictures of the original, full size shooting model. They sit flush with the body of the ship and have a far more accurate barrel shape.