George the Wildfowl guns had 3 inch chambers and were made as both ejector and non-ejector. I have the latter model. Yours is one of the high grade game models some were as plain as can be with just B.S.A. stamped onto the side. Yours will be pretty scarce as they were generally made for the lower end of the market initially as machine made guns and therefore mostly plain but that is one of the nicest I have seen; great find. If you contact John Knibbs
http://www.airgunspares.com/store/ he has the records for BSA guns and can supply more information. I'm sure he would be interested to see the picture too. He wrote an interesting book called 'The Golden Century' which is a concise history of BSA including rifles, air guns and shotguns etc. A scarce book but very interesting.
The BSA dovetail lumps on the barrels are what inspired Winchester with the Model 21. It results in a broad action but a strong one. Lagopus.....
