Michael, your answers are very comprehensively written and documented, a good help to my little knowledge on the subject. Concerning about the inlay been original, no adventure for me, might let you know in decades
. The butt trap has no grayish color or stain of any kind, look clean with little use, maybe an indication of later addition.
Fernando and Michael, the mosquito - mosca as probably the musket's name precursor is most interesting, could never imagine it.
Fernando K, will have a look on your observations.
Many thanks
Vicente