 Complete the following phrase:  The Chassepot was named after its inventor, Antoine Alphonse Chassepot 18331905, who, from the mid-1850s onwards, had constructed various experimental forms of breech loaders. The first two models of the Chassepot still used percussion cap ignition. The third model, using a similar system to the Prussian Dreyse needle gun, became the French service weapon on 30 August 1866. In the following year it made its first appearance at the 