I have a B.S.A.shotgun catalogue that shows a cross sectional view of the action.They are very similar in design to the Anson and Deeley action found on most boxlock guns.Recommend that you have a competent gunsmith provide assistance with inspection and repair of the action. B.S.A. guns were inexpensive, but they were made from the best available materials. The Jessops fluid compressed steel, chopper lump barrels are joined by a vertical dovetail [As used on the Winchester model 21]. The result is a very strong gun, perhaps a little heavy but normally a very reliable.
