Richard,
I think the frame size which is stamped into the recoil lug of your missing barrels is the most important information. Barrels of different gauges can be fitted to a receiver as long as they are the same frame size.
The frame size can be determined by measuring between the center of the firing pin holes of the receiver.
Please do that and post the distance.
I write this because the 16 bore guns are in the highest demand and a spare set of 16 gauge barrels may be almost impossible to find a a reasonable price. If the gun is a 0 frame a set of 20 gauges barrels if you can find them might fit. Alternatively, if the gun is a 1 frame it a set of 12 gauge barrels may be found.
I do however think the forend of the correct frame size will be the hardest to find. Your receiver is the base of a V Grade gun which other than the Trojan model was the bottom grade. It may be the cheapest route to purchase another well used V or Trojan grade of the same frame size and transfer the parts.
Mark
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