It is not very easy to find a rifled carbine in 15 mm resulting from the patent of 1859.
Finding the big brother of the LF 521, that is to say, the LF 520 takes a stroke of luck.
Here they are together for a while.
Perhaps, but why didn’t he continued on the M1862 -M1864 and M1868 and if it was only for the rifle … but no , we only found the ELF marking on the M 1859 arms.