Did you see the second part on Vimeo? That’s the one with the arquebus (matchlock).
…The gist of the video series here, if not apparent, is that there’s apparently a bit of interest around some of these more unique black powder weapons, and “actual” reproductions are hard to come by. However, some of the Indian prop weapons are actually serviceable as working arms once modified – which you do at your own risk. Apparently they work as well as legitimate reproductions so long as they are loaded appropriately, though of course you conduct these modifications at – again – your own risk.
This is the website referenced in the video:
http://www.militaryheritage.com/muskets.htm