The first chain rifle for the British was the 1854 Treeby with external chain exposed and complicated mechanisms that doomed it to failure. Borrowing from this concept were various Harmonica guns made in Europe and US which failed too. Paulin Gay and Henri Guernot, however, wanted to improve the rifle version with an internal chain mag made up of cups holding the 6mm rounds, hollowed out and filled with powder and pellet. It had a long external octagonal barrel that held an internal movable barrel which aligned itself with the first cup of the 80 Rd chain. When charged, the firing pin retracted and barrel secured. Then the firer could shoot all 80 rds as fast as possible. Proved impractical and caused finger and hand injury. And of course, reloading was a bear! The French design was rejected by the British Army and so was proposed to the French and German Armies. Germany helped design a pistol version with 40 rds of 6.5mm, but it went nowhere. The Henry Rifle repeater with 16 rounds was uncomplicated and reliable while Mauser moved towards the K98. An odd rifle, no one knows how many were made.