Hey- Thanks for the link! I can't get a larger picture to show, but are you sure that this rifle satisfies these two requirements?

Muzzleloading firearms must be wheel lock, matchlock, flintlock, or percussion lock.

A percussion lock firearm must use original-style percussion caps that fit on the nipple and are exposed to the weather. “Exposed to the weather” means the percussion cap or the frizzen must be visible and cannot be covered or enclosed by an integral part of the weapon proper.

That one looks like it has a modern trigger that protects the caps. Again, the picture is small and I am new to black powder, so maybe I'm wrong. Let me know....

Thanks!