The interchangeable was an interesting venture into machine production. The A&D action was especially suited to this and Bonehill added their patent clip lumps to the project. The idea was that parts could be ordered by number ready to fit to any Interchangeable gun. Quite radical for the time. I just researched it for my boxlock book (which will be in the shops next October) Shameless plug. Sorry about that. But the guns are actually remarkably well finished and pleasant.

www.vintageguns.co.uk