Sorry Pitchy!
The Browning-designed springpole rifles and shotguns fascinate me. The example I have is a pre-war Savage 720 12 gauge. As the history books show, once Savage acquired rights to use the Browning patent and build semi-auto shotguns they did so from 1930-1949.
My serial number is 42994, and in general all I know is that it must be pre-war manufactured since most Savage guns "impressed" into WW2 service are in the over 60,000 range.
I am at this time interested in determining whether the barrel on this shotgun was factory-installed (or rather, subcontracted) with the vent rib Poly-Choke setup which is on the barrel now.
Only thing wrong, is that the Poly-Choke itself and the attaching collar was cut off at some point.
Interestingly, the research I did on the web right from the current Poly-Choke company website suggests that not only did their company install the vent rib and choke assemblies on a "special order" basis, but that gun manufacturers could have batches or runs of barrels modified in this way as well.
You will notice that the script "Poly-Choke" is engraved into the side of the rib near the breech end. Also, note that the barrel, receiver, and trigger guard are all serial-number matching (42994) which really begs the question: was this a pre-war factory ordered custom job?
Please, by all means help a brother out on this. I will be at a great fun-show today in Fredericksburg, Virginia and hope to spend a little time away from manning a vendor table so I might locate other Savage and Remington guys to chat with.
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Adam