Is this one of the Japanese Tower pistols based on the model 1805 dragoon pistol ?
if it is the is more than sufficient wood in the stock to de-farb it, I have takes several of these
and reworked them into the 1770's light dragoon pistol, first I replace the crappy internals with
correct tumbler bridle and sear, replace cock with a flat "S" style reshape & add moldings around tang
thin forend remove steel rammer and pipe replace with single larger pipe and wood rammer..... from there
it's a pretty good pistol, I also remade one of these to represent a Rappahannock Forge pistol