the gun in the link is made in india with all its good points (eg low price) and its bad points.
the stock is made of inidan rosewood - which we know as teak. the metal parts a regular iron for the metal parts except lock and barrel which is steel.
i have reworked some of the india made flintlocks and came across everything that one could possibly think of. shaking and loose trigger, bend screws, bad threaded breech plugs, lock-nuts that are not turning well, trigger pull more that 15KG! cracked frizzen, hard frizzen springs...
once you fix the problmes (which may not all need to apear in the gun you mentioned) the gun works fine. currentliy i own a 1717 and a 1728 musket, both made in india and after reworking, they all work very well.
a Tulle in .62 caliber with a smoothbore fits perfectly to a character in the F&I wars.
either way, 250$US is a good price.