BSA was a very large concern and also made motor cycles and cars even. They were mainly concerned in air rifle manufacture and some of their .22 target rifles were as good as you could get. They started with a cut price non-ejector boxlock 12 bore and sort of promised the gun trade that they wouldn't make an ejector that would undercut the market; but they did. They range from plain in the extreme to a nicely engraved ejector model. If you can find a copy of the book The Golden Century by John Knibbs it has a wealth of information on BSA. You will also find single barrel 12bore guns and a .410 bolt action gun that they made. The .410 was based on military Lee Speed action and was the first gun to be chambered for the 2 1/2" .410 cartridge which Eley-Kynoch made for the gun. Lagopus.....