Well, then let's put it this way...these are bull-pup rifles made on American receivers. Regardless of nit-picking, and regardless of the fact that only the Arsenal-made AK's have high-capacity receivers and these are not made by Arsenal as Arsenal makes no bull-pup rifles, and regardless of the fact that no other manufacturer uses imported stamped and dimpled receivers, and regardless of the fact that these come from Century and ALL of the Century AK's built on purpose-made high-capacity receivers are built on US made receivers, a simple call to Classic Arms confirmed that these do indeed have US receivers.
So, apart from the obvious mistake of lumping all high-cap receivers together (counter-balanced by the assumption that everyone would know that these are not Arsenal-made bull-pup rifles), in this case, these rifles are, indeed, built on US made receivers.
Ash