Yep, the stock profile has a very "Dutch" look to my eyes, which would make sense, since Scotland's eastern seaports engaged in significant levels of import/export with the Low Countries, including weaponry.

It does indeed have a lateral sear (common to the period), which pops thru the lock plate to engage the hammer at half-cock.

I, too, have heard many nightmare stories of dealing with The Rifle Shoppe, but it has gotten better in the last couple of years. The problem is, they don't keep all those thousands of components in stock (except for common types, like "Brown Bess") but have them cast (from original parts) upon receiving an order....