RJW, just to set things straight: Casimir Lefaucheux did not invent THIS SINGLE-bite action. Even his early 1834 patent for a capping breechloader shows a double-bite activated by the forward underlever. Crudgington-Baker show a cut from the Illustrated London News that shows a single barreled gun or rifle Lefaucheux exhibited in 1851. This cut too shows the two barrel lumps of the typical Lefaucheux double bite action. When Lang saw the Lefaucheux gun at the exhibition, he either misunderstood the lockup or he tried to simplify things. At least, his single bite close to the hinge prooved to be unsatisfactory in the long run and spurred the development of the bewildering variations of single-, treble- and multple-bite guns.