Nitpicking here but this only has barrels, no separate cylinder. But you’re absolutely right, this looks like it could be a seven barrel volley gun. It doesn’t look like the barrel cluster can rotate like the Nock rotary barrel flintlock, and even rotating the barrel cluster wouldn’t solve firing the center barrel. So I think you’re right, it probably fires all 7 barrels at once.
Nitpicking here but this only has barrels, no separate cylinder. But you’re absolutely right, this looks like it could be a seven barrel volley gun. It doesn’t look like the barrel cluster can rotate like the Nock rotary barrel flintlock, and even rotating the barrel cluster wouldn’t solve firing the center barrel. So I think you’re right, it probably fires all 7 barrels at once.