Wanted: Brass/Gunmetal Bronze barreled flintlock muskets, musketoons, carbines, rifles, handguns

All offers welcomed. Doing research for my masters' thesis into the history of brass or "Gunmetal/Bronze" barreled shouldered or handheld guns after the advent of forged wrought iron barrelmaking techniques. Often these were one offs or used in naval contexts. Any info or leads into production, or allocation to troops, or firsthand accounts are also useful, if for some reason any of you would have that.

Thank you for your interest.