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This is an example of a needle fire conversion of a French 1822 rifle based on the patent of L. Merckelbagh. The conversion was done in Paris, probably in the early 1870s. Other base rifles were converted as well (like this example https://collegehillarsenal.com/product.php?productid=2053), but like most upgrade conversion systems it does not appear to have been commercially successful. Unfortunately, there is virtually nothing I could find written about the man or design.
