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I have posted on Pauly guns before. These are essentially the earliest breech loading cartridge firearms. In 1827, after working as an apprentice, Lefaucheux purchased the Pauly business and the rights to the open patents.
By that time Henri Roux and then Eugene Picherau had already adapted the Pauly system to work with percussion. Roux’s changes reworked the internal mechanism to accept cartridges incorporating a percussion cap. Picherau then developed the system further to use external percussion ignition while still permitting breech loading. After Lefaucheux took over he filed one more addendum to the patent in 1828. That addition included a mechanism and clear instructions for converting earlier Pauly type guns into muzzleloaders by moving the percussion nipple onto the barrel and removing the rosette and the cartridge dependence.
The gun I recently acquired appears to follow that Lefaucheux modification. It looks to be an earlier Picherau example that was later altered to permanently close the bascule and have percussion nipples fitted to the barrels, effectively making it a muzzleloader.
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